Follow semver to the letter for simplicity.

CHANGES.txt

@@ -2,12 +2,14 @@
 CHANGES
 =======
 
-20.6
-----
+v20.6.0
+-------
 
 * New release process that relies on
   `bumpversion <https://github.com/peritus/bumpversion>`_
   and Travis CI for continuous deployment.
+* Project versioning semantics now follow
+  `semver <https://semver.org>`_ precisely.
 
 20.5
 ----

docs/developer-guide.txt

@@ -103,10 +103,7 @@ Under continuous integration, additional tests may be run. See the
 Semantic Versioning
 -------------------
 
-Setuptools follows ``semver`` with some exceptions:
-
-- Uses two-segment version when three segment version ends in zero
-- Omits 'v' prefix for tags.
+Setuptools follows ``semver``.
 
 .. explain value of reflecting meaning in versions.
 

setup.cfg

@@ -24,12 +24,8 @@ formats = gztar zip
 universal=1
 
 [bumpversion]
-current_version = 20.5
+current_version = 20.5.0
 commit = True
 tag = True
-parse = (?P<major>\d+)\.(?P<minor>\d+)(\.(?P<patch>\d+))?
-serialize=
-  {major}.{minor}.{patch}
-  {major}.{minor}
 
 [bumpversion:file:setup.py]

setup.py

@@ -68,7 +68,7 @@ wheel = ['wheel'] if needs_wheel else []
 
 setup_params = dict(
     name="setuptools",
-    version="20.5",
+    version="20.5.0",
     description="Easily download, build, install, upgrade, and uninstall "
                 "Python packages",
     author="Python Packaging Authority",