chore: Update GitHub Actions

Author: timonwong

.github/workflows/test.yml renamed to .github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Test
+name: CI
 
 on:
   push:
@@ -10,7 +10,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.13x, 1.14.x, 1.15.x]
+        go-version: [1.14.x, 1.15.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}