up: gh action only test on go 1.18+

Author: inhere

.github/workflows/go.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go_version: [1.16, 1.17, 1.18, 1.19]
+        go_version: [1.18, 1.19]
 
     steps:
     - name: Check out codes