Update README.md to fix link to rust website

the rust-lang.org site requires www and doesn't redirect.
uniq - Add initial implementation
Merge pull request #341 from cbjadwani/uniq

uniq - Add initial implementation
Merge pull request #342 from ebfe/deprecation

Update for crate_id changes
Update rust-crypto
Merge pull request #343 from ebfe/crypto

Update rust-crypto
ToStr::to_str -> ToString::to_string
Merge pull request #344 from ebfe/fix-build-master

Fix build with rust master
Rewrite cut_bytes(), more performant than GNU

Creates BufReader in buffer.rs. BufReader uses a stack allocated buffer
to read into and returns selected slices into the buffer. This does away
with any dynamic allocations in the 'newline loop.

1.5 to 2.5 more performant than previous version.
1.5 to 2.0 times more performant than GNU.
Merge pull request #345 from polyphemus/cut-bytes-rewrite

Rewrite bytes cutting for cut
Implement shuf
shuf: update for latest Rust
shuf: handle stdin
Merge pull request #346 from Arcterus/shuf

Implement shuf
Add shuf to Cargo.toml and remove shuf from to-do list
wc: stop buffering stdin twice
Merge pull request #347 from Arcterus/master

Add shuf to Cargo.toml and remove shuf from to-do list
Merge pull request #348 from Arcterus/wc-buffering

wc: stop buffering stdin twice
kill: implement short signals (fixes #242) and bug fixes
Merge pull request #349 from Arcterus/kill-short-sigs

kill: implement short signals (fixes #242) and bug fixes