Correct PyPI classifier

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

setup.cfg

@@ -12,7 +12,7 @@ author = nexB. Inc. and others
 author_email = [email protected]
 
 classifiers =
-    Development Status ::  4 - Beta
+    Development Status :: 4 - Beta
     Intended Audience :: Developers
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only