Test with go 1.13 and 1.14

Author: Michael Eder

.github/workflows/go.yml

@@ -12,7 +12,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.12.9, 1.13]
+        go-version: [1.14, 1.13]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps: