Actually enable macOS universal build.

Author: scoder

.github/workflows/ci.yml

@@ -142,11 +142,11 @@ jobs:
       matrix:
         #os: [macos-10.15, windows-latest]
         #os: [macos-10.15, macOS-M1]
-        os: [macos-10.15]
+        os: [macos-11.0]
         python_version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
 
     runs-on: ${{ matrix.os }}
-    env: { MACOSX_DEPLOYMENT_TARGET: 10.15 }
+    env: { MACOSX_DEPLOYMENT_TARGET: 11.0 }
 
     steps:
     - uses: actions/checkout@v3