Update __init__.py

Update version to 3.5.1

Author: RobertFlatt

pythonforandroid/recipes/greenlet/__init__.py

@@ -2,7 +2,7 @@
 
 
 class GreenletRecipe(PyProjectRecipe):
-    version = '3.1.1'
+    version = '3.5.1'
     url = 'https://pypi.python.org/packages/source/g/greenlet/greenlet-{version}.tar.gz'
     depends = ['setuptools']
     call_hostpython_via_targetpython = False