Merge branch 'master' into community

Author: pybites

31/README.md

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+## Code Challenge 31 - Imagine Manipulation With Pillow
+
+[Challenge instructions](http://pybit.es/codechallenge31.html).
+
+[To follow along with our challenges](https://github.com/pybites/challenges/blob/master/INSTALL.md).
+
+[Previous challenges and About](http://pybit.es/pages/challenges.html).