ENH: Bump documentation version number

Docs/source/conf.py

@@ -56,9 +56,9 @@ author = 'Andrew Wilson, Venkata S. Arikatla'
 # built documents.
 #
 # The short X.Y version.
-version = '4.0.0'
+version = '5.0.0'
 # The full version, including alpha/beta/rc tags.
-release = '4.0.0'
+release = '5.0.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.