Merge pull request #15 from GrandMoff100/dev

Flake8 worjkflow fix!

Author: GrandMoff100

.github/workflows/flake8.yml

@@ -4,15 +4,18 @@ on:
   pull_request_target:
     paths:
       - '*.py'
+  workflow_dispatch:
 
 jobs:
   flake8_py3:
     runs-on: ubuntu-latest
     steps:
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
       - name: Install flake8
         run: pip install flake8
       - name: Run flake8