Fix conda command in readme

The [conda forge channel](https://anaconda.org/conda-forge/datasets) is lagging behind (as of right now, only 2.7.1 is available), we should recommend using the [Hugging face channel](https://anaconda.org/HuggingFace/datasets) that we are maintaining
```
conda install -c huggingface datasets
```

Comments:
ah didn't read well - it's all good

or maybe it isn't ? `-c huggingface -c conda-forge` installs from HF or from conda-forge ?

<details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.010196 / 0.011353 (-0.001157) | 0.005531 / 0.011008 (-0.005477) | 0.104601 / 0.038508 (0.066093) | 0.041322 / 0.023109 (0.018213) | 0.302080 / 0.275898 (0.026182) | 0.396579 / 0.323480 (0.073099) | 0.008874 / 0.007986 (0.000888) | 0.004482 / 0.004328 (0.000153) | 0.077487 / 0.004250 (0.073236) | 0.051113 / 0.037052 (0.014061) | 0.321850 / 0.258489 (0.063361) | 0.354946 / 0.293841 (0.061105) | 0.039822 / 0.128546 (-0.088724) | 0.012622 / 0.075646 (-0.063024) | 0.337898 / 0.419271 (-0.081374) | 0.048372 / 0.043533 (0.004839) | 0.299646 / 0.255139 (0.044507) | 0.321113 / 0.283200 (0.037914) | 0.114780 / 0.141683 (-0.026903) | 1.475750 / 1.452155 (0.023595) | 1.496307 / 1.492716 (0.003590) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.311443 / 0.018006 (0.293437) | 0.567268 / 0.000490 (0.566778) | 0.006149 / 0.000200 (0.005950) | 0.000089 / 0.000054 (0.000035) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.029407 / 0.037411 (-0.008004) | 0.118611 / 0.014526 (0.104085) | 0.122247 / 0.176557 (-0.054309) | 0.164770 / 0.737135 (-0.572365) | 0.128561 / 0.296338 (-0.167778) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.399185 / 0.215209 (0.183976) | 3.972995 / 2.077655 (1.895340) | 1.764638 / 1.504120 (0.260518) | 1.574058 / 1.541195 (0.032863) | 1.741695 / 1.468490 (0.273205) | 0.705664 / 4.584777 (-3.879113) | 3.915399 / 3.745712 (0.169686) | 2.310154 / 5.269862 (-2.959707) | 1.554067 / 4.565676 (-3.011610) | 0.087133 / 0.424275 (-0.337142) | 0.012393 / 0.007607 (0.004786) | 0.510758 / 0.226044 (0.284713) | 5.114906 / 2.268929 (2.845977) | 2.304473 / 55.444624 (-53.140152) | 1.960768 / 6.876477 (-4.915709) | 2.092263 / 2.142072 (-0.049810) | 0.867973 / 4.805227 (-3.937255) | 0.170000 / 6.500664 (-6.330664) | 0.068358 / 0.075469 (-0.007111) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.211022 / 1.841788 (-0.630765) | 16.777269 / 8.074308 (8.702961) | 15.272659 / 10.191392 (5.081267) | 0.182149 / 0.680424 (-0.498274) | 0.029577 / 0.534201 (-0.504624) | 0.446590 / 0.579283 (-0.132693) | 0.454724 / 0.434364 (0.020360) | 0.541938 / 0.540337 (0.001601) | 0.640886 / 1.386936 (-0.746050) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.008441 / 0.011353 (-0.002912) | 0.006105 / 0.011008 (-0.004904) | 0.100349 / 0.038508 (0.061841) | 0.040675 / 0.023109 (0.017565) | 0.381775 / 0.275898 (0.105877) | 0.425246 / 0.323480 (0.101767) | 0.007197 / 0.007986 (-0.000789) | 0.004972 / 0.004328 (0.000644) | 0.075346 / 0.004250 (0.071096) | 0.065339 / 0.037052 (0.028286) | 0.379340 / 0.258489 (0.120851) | 0.435646 / 0.293841 (0.141805) | 0.038891 / 0.128546 (-0.089656) | 0.013079 / 0.075646 (-0.062568) | 0.339273 / 0.419271 (-0.079999) | 0.057478 / 0.043533 (0.013945) | 0.373516 / 0.255139 (0.118377) | 0.402388 / 0.283200 (0.119189) | 0.123145 / 0.141683 (-0.018538) | 1.503765 / 1.452155 (0.051610) | 1.609797 / 1.492716 (0.117081) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.420354 / 0.018006 (0.402348) | 0.589272 / 0.000490 (0.588782) | 0.045861 / 0.000200 (0.045662) | 0.000527 / 0.000054 (0.000473) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.033918 / 0.037411 (-0.003493) | 0.128041 / 0.014526 (0.113515) | 0.130274 / 0.176557 (-0.046283) | 0.180605 / 0.737135 (-0.556530) | 0.136377 / 0.296338 (-0.159962) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.440343 / 0.215209 (0.225133) | 4.390264 / 2.077655 (2.312610) | 2.218738 / 1.504120 (0.714618) | 2.052399 / 1.541195 (0.511204) | 2.231912 / 1.468490 (0.763422) | 0.716805 / 4.584777 (-3.867972) | 3.909277 / 3.745712 (0.163565) | 2.302121 / 5.269862 (-2.967740) | 1.419454 / 4.565676 (-3.146222) | 0.088067 / 0.424275 (-0.336208) | 0.012994 / 0.007607 (0.005387) | 0.548267 / 0.226044 (0.322223) | 5.462973 / 2.268929 (3.194044) | 2.768414 / 55.444624 (-52.676210) | 2.489320 / 6.876477 (-4.387157) | 2.569546 / 2.142072 (0.427474) | 0.853135 / 4.805227 (-3.952092) | 0.170618 / 6.500664 (-6.330046) | 0.069908 / 0.075469 (-0.005562) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.304726 / 1.841788 (-0.537062) | 17.335977 / 8.074308 (9.261669) | 15.088319 / 10.191392 (4.896927) | 0.190893 / 0.680424 (-0.489531) | 0.018133 / 0.534201 (-0.516068) | 0.429324 / 0.579283 (-0.149959) | 0.439212 / 0.434364 (0.004848) | 0.545312 / 0.540337 (0.004975) | 0.663972 / 1.386936 (-0.722964) |

</details>
</details>

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_The documentation is not available anymore as the PR was closed or merged._