Merging upstream version 0.14.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,13 @@
+<!--- THIS IS A COMMENT BLOCK, REMOVE IT BEFORE SUBMITTING YOUR PR
+
+Thank you for your interest in gitlint and putting in the effort to create a PR!
+
+A few quick notes:
+
+- It's really just me (https://github.com/jorisroovers) maintaining gitlint, and I do so in a hobby capacity. More recently it has become harder for me to find time to maintain gitlint on a regular basis, which in practice means that it might take me a while (sometimes months) to get back to you. Rest assured though, I absolutely look at all PRs as soon as they come in - I just tend to only "work" on gitlint a few times a year.
+- Similarly, after your code is merged, it typically still takes months before I do another release that contains your code. Please don't let that deter you from contributing - I appreciate your patience and understanding!
+- Please review: http://jorisroovers.github.io/gitlint/contributing/
+
+-->
+
+Enter your PR details here

.github/workflows/checks.yml

@@ -1,19 +1,27 @@
 name: Tests and Checks
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   checks:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, pypy2, pypy3]
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, pypy2, pypy3]
         os: ["macos-latest", "ubuntu-latest"]
     steps:
       - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }} # Checkout pull request HEAD commit instead of merge commit
+
+      # Because gitlint is a tool that uses git itself under the hood, we remove git tracking from the checked out
+      # code by temporarily renaming the .git directory. 
+      # This is to ensure that the tests don't have a dependency on the version control of gitlint itself.
+      - name: Temporarily remove git version control from code
+        run: mv .git ._git
 
       - name: Setup python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -57,24 +65,36 @@ jobs:
       #   with:
       #     github-token: ${{ secrets.GITHUB_TOKEN }}
 
+      # Re-add git version control so we can run gitlint on itself.
+      - name: Re-add git version control to code
+        run: mv ._git .git
+
       - name: Gitlint check
-        run: ./run_tests.sh -g
+        run: ./run_tests.sh -g --debug
 
   windows-checks:
     runs-on: windows-latest
     strategy:
       matrix:
-        python-version: [2.7, 3.5]
+        python-version: [2.7, 3.6]
     steps:
       - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }} # Checkout pull request HEAD commit instead of merge commit
 
+      # Because gitlint is a tool that uses git itself under the hood, we remove git tracking from the checked out
+      # code by temporarily renaming the .git directory. 
+      # This is to ensure that the tests don't have a dependency on the version control of gitlint itself.
+      - name: Temporarily remove git version control from code
+        run: Rename-Item .git ._git
+    
       - name: Setup python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: "Upgrade pip on Python 3"
-        if: matrix.python-version == '3.5'
+        if: matrix.python-version == '3.6'
         run: python -m pip install --upgrade pip
 
       - name: Install requirements
@@ -88,8 +108,8 @@ jobs:
       - name: Tests (sanity)
         run: tools\windows\run_tests.bat "gitlint\tests\cli\test_cli.py::CLITests::test_lint"
 
-      - name: Tests (ignore test_cli.py)
-        run: pytest --ignore gitlint\tests\cli\test_cli.py -rw -s gitlint
+      - name: Tests (ignore cli\*)
+        run: pytest --ignore gitlint\tests\cli -rw -s gitlint
 
       - name: Tests (test_cli.py only - continue-on-error:true)
         run: tools\windows\run_tests.bat "gitlint\tests\cli\test_cli.py"
@@ -109,5 +129,9 @@ jobs:
       - name: PyLint
         run: pylint gitlint qa --rcfile=".pylintrc" -r n
 
+      # Re-add git version control so we can run gitlint on itself.
+      - name: Re-add git version control to code
+        run: Rename-Item ._git .git
+
       - name: Gitlint check
         run: gitlint --debug