Use matrix for multiple py versions: python-app-py3.yml (#1)

Author: jakiejj

.github/workflows/python-app-py36.yml .github/workflows/python-app-py3.yml.github/workflows/python-app-py36.yml renamed to .github/workflows/python-app-py3.yml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a single version of Python
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Python 3.6 application
+name: Python 3 application
 
 on:
   push:
@@ -11,24 +11,28 @@ on:
 
 jobs:
   build:
-
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7]
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.6
+    - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
-        python-version: 3.6
+        python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python setup.py develop
     - name: Lint with flake8
       run: |
-        pip install flake8
+        python -m pip install --upgrade pip
+        pip install -U flake8
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --ignore=E121,E123,E226,W292,E402 --max-line-length=160 --exclude=src/detext/model/bert/*.py --show-source --statistics
     - name: Test with pytest
       run: |
         pip install pytest
         pytest
+