update buildci

Author: xwings

.github/workflows/build-ci.yml

@@ -11,19 +11,15 @@ jobs:
       matrix:
         #os: [windows-2019, macos-10.15, ubuntu-18.04, ubuntu-20.04]
         os: [windows-2019, ubuntu-18.04, ubuntu-20.04]
-        python-version: [3.6.8, 3.7.6, 3.8.5]
+        python-version: [3.7.6, 3.8.5]
         exclude:
           - os: ubuntu-20.04
             python-version: 3.7.6       
           - os: ubuntu-20.04
             python-version: 3.8.5
-          - os: windows-2019
-            python-version: 3.6.8
           - os: windows-2019
             python-version: 3.7.6                 
           # - os: macos-10.15
-          #   python-version: 3.6.8
-          # - os: macos-10.15
           #   python-version: 3.7.6                       
         include:
           - os: ubuntu-20.04