BREAKING CHANGE: require Node.js 18+ (#15)

* refactor: remove execall && require Node.js 18+

* 2.1.0

* Update package-lock.json+1

* CI: update node versions

* CI: use npm

Author: azu

.github/workflows/test.yml

@@ -6,15 +6,15 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12, 14]
+        node-version: [ 18, 20, 22 ]
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
       - name: Install
-        run: yarn install
+        run: npm ci
       - name: Test
-        run: yarn test
+        run: npm test