Revert version string back to 3.0.0rc11 and use LooseVersion to extract stable component.

Author: jonmmease

Diff for: plotly/version.py

@@ -1,4 +1,4 @@
-__version__ = '3.0.0-rc.11'
+__version__ = '3.0.0rc11'
 __frontend_version__ = '^0.1.1'
 
 
@@ -7,7 +7,9 @@ def stable_semver():
     Get the stable portion of the semantic version string (the first three
     numbers), without any of the trailing labels
 
-    '3.0.0-rc.11' -> '3.0.0'
+    '3.0.0rc11' -> '3.0.0'
     """
-
-    return __version__.split('-')[0]
+    from distutils.version import LooseVersion
+    version_components = LooseVersion(__version__).version
+    stable_ver_str = '.'.join(str(s) for s in version_components[0:3])
+    return stable_ver_str