Upgrade actions/checkout version and remove Travis config

Author: muan

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Use Node.js 12.x
       uses: actions/setup-node@v1
       with: