MAINT: Add automation for releases.

Author: Scott Sanderson

.github/release-drafter-config.yml

@@ -0,0 +1,5 @@
+name-template: 'Release $NEXT_PATCH_VERSION'
+tag-template: '$NEXT_PATCH_VERSION'
+template: |
+  ## What’s Changed
+  $CHANGES

.github/workflows/master-merge.yml

@@ -0,0 +1,15 @@
+name: Draft New Release on Merge to Master
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  draft-release:
+    name: Draft New Release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v5
+        with:
+          config-name: release-drafter-config.yml

.github/workflows/release.yml

@@ -0,0 +1,46 @@
+name: Publish Python to PyPI
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-n-publish:
+    name: Build and publish Python distributions to TestPyPI
+    runs-on: ubuntu-18.04
+    steps:
+
+    - name: Check out repository.
+      uses: actions/checkout@master
+
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+
+    - name: Build sdist
+      run: python setup.py sdist
+
+    - name: Publish to Test PyPI
+      uses: pypa/gh-action-pypi-publish@v1
+      with:
+        user: __token__
+        password: ${{ secrets.test_pypi_token }}
+        repository_url: https://test.pypi.org/legacy/
+
+    - name: Install from test PyPI and Ensure Imports Work
+      run: |
+        python -m pip install --upgrade pip
+        pip install --extra-index-url https://test.pypi.org/simple python-interface
+        python -c 'import interface; print(interface.__version__)'
+        pip uninstall -y interface
+
+    - name: Publish distribution to PyPI
+      uses: pypa/gh-action-pypi-publish@v1
+      with:
+        user: __token__
+        password: ${{ secrets.pypi_token }}
+
+    - name: Install and test running
+      run: |
+        pip install python-interface
+        python -c 'import interface; print(interface.__version__)'