Add release drafter (#44)

.github/release-drafter.yml

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+name-template: "$RESOLVED_VERSION"
+tag-template: "v$RESOLVED_VERSION"
+categories:
+  - title: "Breaking Changes"
+    label: "breaking-change"
+  - title: "Dependencies"
+    collapse-after: 1
+    labels:
+      - "dependencies"
+
+version-resolver:
+  major:
+    labels:
+      - "major"
+      - "breaking-change"
+  minor:
+    labels:
+      - "minor"
+      - "new-feature"
+  patch:
+    labels:
+      - "bugfix"
+      - "dependencies"
+      - "documentation"
+      - "enhancement"
+  default: patch
+
+template: |
+  ## What's Changed
+
+  $CHANGES

.github/workflows/release-drafter.yml

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+name: Release Drafter
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: read
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v6
+        id: drafter
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: actions/checkout@v4
+
+      - name: Set library.json version
+        run: |
+          sed -i "s/\"version\": .*/\"version\": \"${{ steps.drafter.outputs.resolved_version }}\"/g" library.json
+
+      - name: Commit changes
+        run: |
+          if ! git diff --quiet; then
+            git config --global user.name "esphomebot"
+            git config --global user.email "[email protected]"
+            git commit -am "Bump version to ${{ steps.drafter.outputs.resolved_version }}"
+            git push
+          fi