Fixed a doc config error

docs/conf.py

@@ -49,9 +49,9 @@ import pkg_resources
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 release = __import__('pkg_resources').get_distribution('Flask').version
+if 'dev' in release:
+    release = release.split('dev')[0] + 'dev'
 version = '.'.join(release.split('.')[:2])
-if 'dev' in version:
-    version = version.split('dev')[0]
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.