Prepare for alpha (0.1.0) release

* update version to 0.1.0
* copy recent code & test changes from original repo
* switch CI tests to run Node 14 and 16 (remove 15)
* run prettier --fix
* update dependencies
* update .gitignore

.github/workflows/test.yml

@@ -5,13 +5,23 @@ on:
     branches:
       - main
 jobs:
-  test:
+  test-node16:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: use node.js v15.x
+      - name: use node.js v16.x
         uses: actions/setup-node@v1
         with:
-          node-version: 15.x
+          node-version: 16.x
+      - run: npm ci --no-optional
+      - run: npm test
+  test-node14:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: use node.js v14.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
       - run: npm ci --no-optional
       - run: npm test

.gitignore

@@ -1,3 +1,5 @@
 node_modules/
 dist/
 .eslintcache
+.vscode/
+*.tgz