Bump version: 0.4.0 → 0.5.0.dev

.bumpversion.cfg

 [bumpversion]
-current_version = 0.4.0
+current_version = 0.5.0.dev
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\.(?P<release>[a-z0-9]+))?
 serialize = 
 	{major}.{minor}.{patch}.{release}

setup.cfg

@@ -3,7 +3,7 @@
 [metadata]
 name = differential_privacy
 # Do not modify version manually. Use bump2version instead.
-version = 0.4.0
+version = 0.5.0.dev
 author = Wikimedia Foundation Privacy team
 description = Spark pipelines for differential privacy
 long_description = file: README.md