Add a link to gitter lobby
It's surprisingly hard to google it when you don't  know about it at all.
@@ -36,6 +36,7 @@ to! Here are some tips:
how to add LALRPOP to your `Cargo.toml`.
- The [advanced setup] chapter shows how to configure other aspects of LALRPOP's
preprocessing.
+- If you have any questions join our [gitter lobby].
### Example Uses
@@ -51,7 +52,7 @@ to! Here are some tips:
[LALRPOP]: https://github.com/lalrpop/lalrpop/blob/8034f3dacc4b20581bd10c5cb0b4f9faae778bb5/lalrpop/src/parser/lrgrammar.lalrpop
[Gluon]: https://github.com/gluon-lang/gluon/blob/d7ce3e81c1fcfdf25cdd6d1abde2b6e376b4bf50/parser/src/grammar.lalrpop
[RustPython]: https://github.com/RustPython/RustPython/blob/master/parser/src/python.lalrpop
-
+[gitter lobby]: https://gitter.im/lalrpop/Lobby
### Contributing
