feat: add semantic-release (#920)

.github/workflows/release.yml

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+name: Release
+on:
+  push:
+    branches:
+      - main
+      - canary
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - name: Install dependencies
+        run: npm ci
+      - name: Lint  
+        run: npm run lint
+      - name: Build
+        run: npm run build
+      - name: Release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npx semantic-release

.releaserc.json

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+{
+  "branches": [
+    "main",
+    { "name": "canary", "prerelease": true }
+  ],
+  "plugins": [
+    ["@semantic-release/commit-analyzer", {
+      "preset": "conventionalcommits"
+    }],
+    ["@semantic-release/release-notes-generator", {
+      "preset": "conventionalcommits",
+      "presetConfig": {
+        "types": [
+          { "type": "feat", "section": "Features", "hidden": false },
+          { "type": "fix", "section": "Bug Fixes", "hidden": false },
+          { "type": "perf", "section": "Performance Improvements", "hidden": false },
+          { "type": "revert", "section": "Reverts", "hidden": false },
+          { "type": "docs", "section": "Documentation", "hidden": false },
+          { "type": "style", "section": "Styles", "hidden": false },
+          { "type": "chore", "section": "Miscellaneous Chores", "hidden": false },
+          { "type": "refactor", "section": "Code Refactoring", "hidden": false },
+          { "type": "test", "section": "Tests", "hidden": false },
+          { "type": "build", "section": "Build System", "hidden": false },
+          { "type": "ci", "section": "Continuous Integration", "hidden": false }
+        ]
+      }
+    }],
+    "@semantic-release/git",
+    "@semantic-release/npm"
+  ]
+}

CHANGELOG.md

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+# CHANGELOG
+
+The changelog is automatically updated using
+[semantic-release](https://github.com/semantic-release/semantic-release). You
+can see it on the [releases page](../../releases).