Update Readme.md

Readme.md

@@ -47,6 +47,6 @@ Runtime options include:
 - python-2.7.8
 - python-3.4.1
 - pypy-2.3.1 (unsupported, experimental)
-- pypy3-2.3.1 (unsupported, experimental) 
+- pypy3-2.3.1 (unsupported, experimental)
 
 Other [unsupported runtimes](https://github.com/heroku/heroku-buildpack-python/tree/master/builds/runtimes) are available as well.