fix python version version test

Author: xwings

.github/workflows/build-ci.yml

@@ -11,14 +11,14 @@ 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: [3.8]
+        python-version: [3.7, 3.8]
         exclude:
-          # - os: ubuntu-20.04
-          #   python-version: 3.7       
-          # - os: ubuntu-20.04
-          #   python-version: 3.7
-          # - os: windows-2019
-          #   python-version: 3.7             
+          - os: ubuntu-20.04
+            python-version: 3.7       
+          - os: ubuntu-18.04
+            python-version: 3.7
+          - os: windows-2019
+            python-version: 3.7             
           # - os: macos-10.15
           #   python-version: 3.8
         include: