added npm workflow mod fix

Author: calumk

.github/workflows/npm-publish.yml

@@ -9,7 +9,7 @@ jobs:
         with:
           node-version: 10
       - run: npm install
-      - run: npm build
+      - run: npm run build
       - uses: JS-DevTools/npm-publish@v1
         with:
           token: ${{ secrets.NPM_TOKEN }}