chore: cut off support below1.15

Author: wafuwafu13

.github/workflows/tests.yml

@@ -15,9 +15,9 @@ jobs:
           - "1.18"
           - "1.17"
           - "1.16"
-          - "1.15"
-          - "1.14"
-          - "1.13"
+          # - "1.15"
+          # - "1.14"
+          # - "1.13"
 
     steps:
       - name: Set up Go ${{ matrix.go }}