Require Node.js 12.20 and move to ESM (#138)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

Author: Richienb

.github/workflows/main.yml

@@ -10,12 +10,12 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
+          - 16
           - 14
           - 12
-          - 10
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 yarn.lock
 .nyc_output
+coverage