Update CONTRIBUTING.md

mention bots wiki entry

CONTRIBUTING.md

@@ -9,8 +9,10 @@ If you found a bug or issue with Pharo please let us know. You can report bugs o
 *  Send a mail to the mailing-list pharo-dev mailing if you are not sure.
 *  Open a bug entry on https://github.com/pharo-project/pharo/issues. But before check if the bug was already reported!
 *  Do not forget to mention the virtual machine version, your OS and other crucial information
+*  Some bots are there to help you: https://github.com/pharo-project/pharo/wiki/Issue-Tracker-Bots
 *  Follow your bug. It may happen that your bug is fixed by introducing another bug fix and you can verify and close it.
 
+
 ### How to propose a bug fix or enhancement
 * First, sign the [license agreement](http://files.pharo.org/media/PharoSoftwareDistributionAgreement.pdf).
 * See the wiki page: *https://github.com/pharo-project/pharo/wiki/Contribute-a-fix-to-Pharo*