ci: Add release-drafter (#18)

.github/release-drafter.yml

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+name-template: 'v$RESOLVED_VERSION 🌈'
+tag-template: 'v$RESOLVED_VERSION'
+categories:
+  - title: "🚨 Breaking changes"
+    labels:
+      - "breaking-change"
+  - title: "✨ New features"
+    labels:
+      - "new-feature"
+  - title: "🐛 Bug fixes"
+    labels:
+      - "bugfix"
+  - title: "🚀 Enhancements"
+    labels:
+      - "enhancement"
+      - "refactor"
+      - "performance"
+  - title: "🧰 Maintenance"
+    labels:
+      - "maintenance"
+      - "ci"
+  - title: "📚 Documentation"
+    labels:
+      - "documentation"
+  - title: "⬆️ Dependency updates"
+    labels:
+      - "dependencies"
+change-template: '- $TITLE @$AUTHOR (#$NUMBER)'
+change-title-escapes: '\<*_&' # You can add # and @ to disable mentions, and add ` to disable code blocks.
+version-resolver:
+  major:
+    labels:
+      - 'major'
+  minor:
+    labels:
+      - 'minor'
+  patch:
+    labels:
+      - 'patch'
+  default: patch
+template: |
+  ## Changes
+
+  $CHANGES

.github/workflows/release-drafter.yml

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+---
+name: Release Drafter
+
+# yamllint disable-line rule:truthy
+on:
+    push:
+      branches:
+        - main
+    workflow_dispatch:
+
+jobs:
+  update_release_draft:
+    name: ✏️ Draft release
+    runs-on: ubuntu-latest
+    steps:
+      - name: 🚀 Run Release Drafter
+        uses: release-drafter/[email protected]
+        env:
+            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/update-major-minor-tags.yml

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+---
+name: Update Major Minor Tags
+
+# yamllint disable-line rule:truthy
+on:
+  push:
+    branches-ignore:
+      - '**'
+    tags:
+      - 'v*.*.*'
+
+jobs:
+  update_major_minor_tags:
+    name: Make sure major and minor tags are up to date on a patch release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run Update semver
+        uses: haya14busa/[email protected]