Adding upstream version 0.13.1.

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

.github/ISSUE_TEMPLATE/issue-template.md

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+---
+name: Issue template
+about: Bug reports, feature requests
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--- THIS IS A COMMENT BLOCK, REMOVE IT BEFORE SUBMITTING YOUR ISSUE
+
+Thank you for your interest in gitlint and taking the time to open a bug report!
+
+A few quick notes:
+
+- If you can, please include the output of `gitlint --debug` as this includes useful debugging info.
+- 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 read all bug reports as soon as they come in - I just tend to only "work" on gitlint a few times a year.
+- If you're looking to contribute code to gitlint, please start here: http://jorisroovers.github.io/gitlint/contributing/
+
+-->
+
+Enter your issue details here

.github/workflows/checks.yml

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+name: Tests and Checks
+
+on: [push]
+
+jobs:
+  checks:
+    runs-on: "ubuntu-latest"
+    strategy:
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, pypy2, pypy3]
+        os: ["macos-latest", "ubuntu-latest"]
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup python
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install requirements
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install -r test-requirements.txt
+
+      - name: Unit Tests
+        run: ./run_tests.sh
+
+      # Coveralls integration doesn't properly work at this point, also see below
+      # - name: Coveralls
+      #   env:
+      #     COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
+      #   run: coveralls
+
+      - name: Integration Tests
+        run: ./run_tests.sh -i
+
+      - name: Integration Tests (GITLINT_USE_SH_LIB=0)
+        env:
+          GITLINT_USE_SH_LIB: 0
+        run: ./run_tests.sh -i
+
+      - name: PEP8
+        run: ./run_tests.sh -p
+
+      - name: PyLint
+        run: ./run_tests.sh -l
+
+      - name: Build tests
+        run: ./run_tests.sh --build
+
+      # Coveralls GH Action currently doesn't support current non-LCOV reporting format
+      # For now,  still using Travis for unit test coverage reporting
+      # https://github.com/coverallsapp/github-action/issues/30
+      # - name: Coveralls
+      #   uses: coverallsapp/github-action@master
+      #   with:
+      #     github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Gitlint check
+        run: ./run_tests.sh -g
+
+  windows-checks:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        python-version: [2.7, 3.5]
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup python
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: "Upgrade pip on Python 3"
+        if: matrix.python-version == '3.5'
+        run: python -m pip install --upgrade pip
+
+      - name: Install requirements
+        run: |
+          pip install -r requirements.txt
+          pip install -r test-requirements.txt
+
+      - name: gitlint --version
+        run: gitlint --version
+
+      - 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 (test_cli.py only - continue-on-error:true)
+        run: tools\windows\run_tests.bat "gitlint\tests\cli\test_cli.py"
+        continue-on-error: true # Known to fail at this point
+
+      - name: Tests (all - continue-on-error:true)
+        run: tools\windows\run_tests.bat
+        continue-on-error: true # Known to fail at this point
+
+      - name: Integration tests (continue-on-error:true)
+        run: pytest -rw -s qa
+        continue-on-error: true # Known to fail at this point
+
+      - name: PEP8
+        run: flake8 gitlint qa examples
+
+      - name: PyLint
+        run: pylint gitlint qa --rcfile=".pylintrc" -r n
+
+      - name: Gitlint check
+        run: gitlint --debug