Merge pull request #105 from jdufresne/gha-mypy

Run the full test suite on GitHub actions

.github/workflows/python-package.yml

@@ -8,12 +8,33 @@ on:
   - pull_request
 
 jobs:
-  build:
+  mypy:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - '3.5'
+          - '3.6'
+          - '3.7'
+          - '3.8'
+          - '3.9'
 
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: python -m pip install mypy
+      - name: Check types with mypy
+        run: mypy --strict idna
+
+  build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9']
+        python-version: ['3.5', '3.6', '3.7', '3.8', '3.9', 'pypy3']
 
     steps:
     - uses: actions/checkout@v2