Require Node.js 12 and move to ESM

.github/funding.yml

@@ -1,4 +1,4 @@
-github: [sindresorhus,Qix-]
+github: [sindresorhus, Qix-]
 open_collective: sindresorhus
 tidelift: npm/chalk
 custom: https://sindresorhus.com/donate

.github/workflows/main.yml

@@ -12,10 +12,9 @@ jobs:
         node-version:
           - 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