Prepare release 5.0.0

CHANGELOG

@@ -1,3 +1,5 @@
+Version 5.0.0 - 2018-10-01
+* Bug fixes (see mercurial logs for details)
 * Add support for Python 3.7
 * Remove support for Python 2.7
 

proteus/__init__.py

@@ -10,7 +10,7 @@ from decimal import Decimal
 
 import proteus.config
 
-__version__ = "4.9.0"
+__version__ = "5.0.0"
 __all__ = ['Model', 'Wizard', 'Report']
 
 _MODELS = threading.local()