Simplify bumversion config

Author: asvetlov

.bumpversion.cfg

@@ -1,17 +1,15 @@
 [bumpversion]
 current_version = 0.14.2a0
-parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)((?P<release>[a-z]+)(?P<prerelease_number>\d+))?
+parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\-(?P<release>[a-z]+))?
 serialize =
-        {major}.{minor}.{patch}{release}{prelease_number}
+        {major}.{minor}.{patch}{release}
         {major}.{minor}.{patch}
 
-commit = True
-tag = True
+# commit = True
+# tag = True
 
 [bumpversion:file:aiohttp/__init__.py]
 
 [bumpversion:part:release]
-optional_value = b
 values =
-        a
-        b
+        a0