fix unconvert linter

Signed-off-by: Tim Ramlot <[email protected]>

Author: inteon

.golangci.yaml

@@ -17,7 +17,6 @@ linters:
           - nilerr
           - noctx
           - predeclared
-          - unconvert
           - unparam
           - usestdlibvars
         text: .*

api/common.go

@@ -26,5 +26,5 @@ func (t Time) MarshalJSON() ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	return []byte(jsonStr), nil
+	return jsonStr, nil
 }