feat!: convert to es modules, drop node 10 (#359)

BREAKING CHANGE: this module now requires node.js 12 and above, and has moved to es modules by default.

.github/workflows/ci.yaml

@@ -6,20 +6,21 @@ on:
 name: ci
 env:
   FORCE_COLOR: 2
-  NODE: 14
+  NODE: 16
 jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        node: [10, 12, 14, 16]
+        node: [12, 14, 16]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
           cache: npm
+      - run: node -v
       - run: npm ci
       - run: npm test
       - run: npm run codecov

.prettierrc.json

@@ -0,0 +1,6 @@
+{
+  "bracketSpacing": false,
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "arrowParens": "avoid"
+}