Remove references to retired Python 2

Author: greg-db

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, windows-latest]
-        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, pypy-2.7, pypy-3.7]
+        python-version: [3.5, 3.6, 3.7, 3.8, pypy-2.7, pypy-3.7]
         exclude:
           - os: windows-latest
             python-version: 3.6
@@ -65,7 +65,7 @@ jobs:
     strategy:
       matrix:
           os: [macos-latest, windows-latest]
-          python-version: [2.7, 3.5, 3.6, 3.7, 3.8, pypy-2.7, pypy-3.7]
+          python-version: [3.5, 3.6, 3.7, 3.8, pypy-3.7]
           exclude:
             - os: windows-latest
               python-version: 3.6

.github/workflows/pypiupload.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [2.7, 3.x]
+        python-version: [3.x]
 
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -71,7 +71,6 @@
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',