Fix typo in ci.yml

Author: epicfaace

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
  deploy:
  runs-on: ubuntu-latest
  needs: build
- if: github.ref == 'refs/head/master'
+ if: github.ref == 'refs/heads/master'
  steps:
  - uses: actions/checkout@v2
  - name: Use Node.js 13.x