Update .github/workflows/build.yaml

Author: pellared

.github/workflows/build.yaml

@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.13.x, oldstable, stable]
+        go-version: [oldstable, stable]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps: