Draft NOTES for 1.13.0

@mglukhovsky can you please review?

@danielmewes @Tryneus @mlucy @danielmewes @neumino @srh Please also take a look to make sure I haven't mis-characterized some of your fixes.
You can call run without argument too:
```
r.connect().then(function(conn) {
   query.run(conn).then(...)
})
```

Maybe we should say "Make the options of `r.connect` not required"? (Or something better)