Set version back to 5.0a11, it was never released

Author: Photonios

setup.py

@@ -33,7 +33,7 @@ def run(self):
 
 setup(
     name='django-localized-fields',
-    version='5.0a12',
+    version='5.0a11',
     packages=find_packages(exclude=['tests']),
     include_package_data=True,
     license='MIT License',