Drop Python 2.7 support

This is now a Python 3-only package.

Change-Id: I1923d1dcd92cce349211dee5b01a3c365b151ead
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

.zuul.yaml

@@ -1,5 +1,5 @@
 - project:
     templates:
-      - openstack-python-jobs
       - openstack-python36-jobs
       - openstack-python37-jobs
+      - openstack-python38-jobs

setup.cfg

@@ -4,17 +4,19 @@ author = Christophe de Vienne
 author-email = python-wsme@googlegroups.com
 summary = Simplify the writing of REST APIs, and extend them with additional protocols.
 description-file = README.rst
-url = http://git.openstack.org/cgit/openstack/wsme
+url = https://opendev.org/x/wsme
 license = MIT
+python_requires = >=3.6
 classifier =
     Development Status :: 3 - Alpha
     Operating System :: OS Independent
     Programming Language :: Python
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: Implementation :: PyPy
     License :: OSI Approved :: MIT License
@@ -37,8 +39,3 @@ extra_files =
     setup.py
     README.rst
     tests
-
-[bdist_wheel]
-# WSME has different requirements depending on the version of Python
-# being used, so we cannot build universal wheels.
-universal = 0

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 3.1
-envlist = py27,py35,py36,pypy,coverage,pep8
+envlist = py36,py37,py38,py39,pypy,coverage,pep8
-ignore_basepython_conflict = True
+ignore_basepython_conflict = true
 
 [testenv]
 basepython = python3