Remove go 1.14.x from CI

Author: moorereason

.github/workflows/build.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.14.x, 1.15.x]
+        go-version: [1.15.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     runs-on: ${{ matrix.os }}