Drop python 2.7 build.

.github/workflows/pythonpackage.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [2.7, 3.6, 3.7, 3.8, pypy2, pypy3]
+        python-version: [3.6, 3.7, 3.8, pypy3]
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/pythonpublish.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['2.x', '3.x']
+        python-version: ['3.x']
 
     steps:
     - uses: actions/checkout@v2