Fix typo in gh action

Author: codeasashu

.github/workflows/gh-pages.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
       - run: npm i
-      - run: npm build
+      - run: npm run build
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
         if: ${{ github.ref == 'refs/heads/master' }}