docs: update instructions to use current Node.js LTS

Author: wagoid

README.md

@@ -134,7 +134,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-node@v1
         with:
-          node-version: '10.x'
+          node-version: '14'
       - run: npm install
       # Run the commitlint action, considering its own dependencies and yours as well 🚀
       # `github.workspace` is the path to your repository.