flake8 ci added

.github/workflows/flake8.yml

@@ -0,0 +1,21 @@
+name: flake8 Lint
+
+on: [push, pull_request]
+
+jobs:
+  flake8-lint:
+    runs-on: ubuntu-latest
+    name: Lint
+    steps:
+      - name: Check out source repository
+        uses: actions/checkout@v2
+      - name: Set up Python environment
+        uses: actions/setup-python@v1
+        with:
+          python-version: "3.8"
+      - name: flake8 Lint
+        uses: py-actions/flake8@v1
+        with:
+          ignore: "E501"
+          exclude: "pyerrors/__init__.py"
+          path: "pyerrors"