drop python 3.6

Author: bcebere

.github/workflows/pythonpublish-linux.yml

@@ -9,7 +9,6 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - cp36-cp36m
           - cp37-cp37m
           - cp38-cp38
           - cp39-cp39

.github/workflows/pythonpublish-macos.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
       - uses: actions/checkout@v2

.github/workflows/pythonpublish-windows.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
       - uses: actions/checkout@v2