Bump version to v3.3.6.dev

Author: carlos-villavicencio-adsk

setup.py

@@ -27,7 +27,7 @@
 
 setup(
     name='shotgun_api3',
-    version='3.3.6',
+    version='3.3.6.dev',
     description='Shotgun Python API ',
     long_description=readme,
     author='Shotgun Software',