Rename GitHub Actions folder (#60)

Author: mariotsi

.github/workflow/main.yml .github/workflows/main.yml.github/workflow/main.yml renamed to .github/workflows/main.yml

@@ -29,5 +29,6 @@ jobs:
         with:
           node-version: "${{ matrix.node-version }}"
       - uses: actions/checkout@v2
+      - run: npm install
       - run: npm run lint
       - run: npm run test-and-coverage