Add release and release drafter workflows (#22)

* add release drafter workflow

* add release workflow

.github/release-drafter.yml

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+categories:
+  - title: ':boom: Breaking Changes'
+    label: 'breaking'
+  - title: ':package: Build System'
+    label: 'build'
+  - title: ':construction_worker: Continuous Integration'
+    label: 'ci'
+  - title: ':books: Documentation'
+    label: 'documentation'
+  - title: ':rocket: Features'
+    label: 'enhancement'
+  - title: ':beetle: Fixes'
+    label: 'bug'
+  - title: ':racehorse: Performance'
+    label: 'performance'
+  - title: ':hammer: Refactoring'
+    label: 'refactoring'
+  - title: ':fire: Removals and Deprecations'
+    label: 'removal'
+  - title: ':lipstick: Style'
+    label: 'style'
+  - title: ':rotating_light: Testing'
+    label: 'testing'
+template: |
+  ## What’s Changed
+
+  $CHANGES

.github/workflows/release-drafter.yml

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+name: Release Drafter
+on:
+  push:
+    branches:
+      - main
+jobs:
+  draft_release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yml

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+name: Release
+on:
+  release:
+    types: [published]
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/[email protected]
+      with:
+        python-version: '3.8'
+        architecture: x64
+    - run: pip install --constraint=.github/workflows/constraints.txt pip
+    - run: pip install --constraint=.github/workflows/constraints.txt poetry
+    - run: poetry build
+    - run: poetry publish --username=__token__ --password=${{ secrets.PYPI_TOKEN }}

.github/workflows/requirements.txt

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+pip==22.0.3
+poetry==1.1.12