Added macOS 11 to the test matrix

Author: agronholm

.github/workflows/codeqa-test.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-10.15, macos-11.0, windows-latest]
         python-version: [2.7, 3.6, 3.9, pypy2, pypy3]
         exclude:
         - os: macos-latest