docs: have verb in sentence
@@ -195,7 +195,7 @@ The baresip project is using the BSD license.
## Contributing
-Patches can sent via Github
+Patches can be sent via Github
[Pull-Requests](https://github.com/creytiv/baresip/pulls) or to the RE devel
[mailing-list](http://lists.creytiv.com/mailman/listinfo/re-devel).
