Upgrade actions/checkout version and remove Travis config

.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:

.travis.yml

@@ -1,8 +0,0 @@
-language: node_js
-node_js:
-  - "node"
-addons:
-  chrome: stable
-cache:
-  directories:
-    - node_modules