Merge pull request scala#229 from SethTisue/no-more-gitter-room

no more Gitter room

Author: SethTisue

Diff for: README.md

@@ -76,4 +76,5 @@ details.
 
  * See the [Scala Developer Guidelines](https://github.com/scala/scala/blob/2.13.x/CONTRIBUTING.md) for general contributing guidelines
  * Have a look at [existing issues](https://github.com/scala/scala-parser-combinators/issues)
- * Ask questions and discuss [on Gitter](https://gitter.im/scala/scala-parser-combinators)
+ * Ask questions and discuss [on Gitter](https://gitter.im/scala/contributors)
+ * Feel free to open draft pull requests with partially completed changes, to get feedback.