setup verion number for release

Author: Russell Hay

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name='tableaudocumentapi',
-    version='0.5.dev0',
+    version='0.5',
     author='Tableau',
     author_email='github@tableau.com',
     url='https://github.com/tableau/document-api-python',