update ci

Author: staugur

.github/workflows/ci.yml

@@ -12,11 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        flask-version: ["1.0", "1.1.0", "2.0.0"]
-        python-version: [2.7, 3.6, 3.7, 3.8, 3.9]
-        exclude:
-          - flask-version: "2.0.0"
-            python-version: 2.7
+        flask-version: ["1.0", "1.1.0", "2.0.0", "2.1.0"]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2