Using action for pre-commit

Author: henryiii

.github/workflows/tests.yml

@@ -9,24 +9,16 @@ on:
       - master
 
 jobs:
-  formatting:
+  pre-commit:
     name: Formatting
     runs-on: ubuntu-latest
-
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions/setup-python@v1
-        with:
-          python-version: '3.7'
-          architecture: 'x64'
-
-      - name: Install pre-commit
-        run: python -m pip install pre-commit
-
-      - name: Run pre-commit
-        run: pre-commit run --all
-
-      - name: Display format changes
-        run: git diff --exit-code
-        if: always()
-
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+    - name: set PY
+      run: echo "::set-env name=PY::$(python --version --version | sha256sum | cut -d' ' -f1)"
+    - uses: actions/cache@v1
+      with:
+        path: ~/.cache/pre-commit
+        key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
+    - uses: pre-commit/action@v1.0.0

README.md

@@ -5,6 +5,7 @@
 [![Build Status Linux and macOS][travis-badge]][travis]
 [![Build Status Windows][appveyor-badge]][appveyor]
 [![Build Status Azure][azure-badge]][azure]
+[![Actions Status][actions-badge]][actions-link]
 [![Code Coverage][codecov-badge]][codecov]
 [![Codacy Badge][codacy-badge]][codacy-link]
 [![Join the chat at https://gitter.im/CLI11gitter/Lobby][gitter-badge]][gitter]
@@ -870,6 +871,8 @@ CLI11 was developed at the [University of Cincinnati][] to support of the [GooFi
 [travis]: https://travis-ci.org/CLIUtils/CLI11
 [appveyor-badge]: https://img.shields.io/appveyor/ci/HenrySchreiner/cli11/master.svg?label=Windows
 [appveyor]: https://ci.appveyor.com/project/HenrySchreiner/cli11
+[actions-badge]: https://github.com/CLIUtils/CLI11/workflows/Tests/badge.svg
+[actions-link]:  https://github.com/CLIUtils/CLI11/actions
 [codecov-badge]: https://codecov.io/gh/CLIUtils/CLI11/branch/master/graph/badge.svg
 [codecov]: https://codecov.io/gh/CLIUtils/CLI11
 [gitter-badge]: https://badges.gitter.im/CLI11gitter/Lobby.svg