add comments to satisfy gofmt

dialects/postgres/postgres.go

@@ -56,17 +56,19 @@ func (h *Hstore) Scan(value interface{}) error {
 	return nil
 }
 
-// for Postgresql's JSONB data type
+// Jsonb Postgresql's JSONB data type
 type Jsonb struct {
 	json.RawMessage
 }
 
+// Value get value of Jsonb
 func (j Jsonb) Value() (driver.Value, error) {
 	return j.MarshalJSON()
 }
 
+// Scan scan value into Jsonb
 func (j *Jsonb) Scan(value interface{}) error {
-	bytes, ok := value.([]byte);
+	bytes, ok := value.([]byte)
 	if !ok {
 		return errors.New(fmt.Sprint("Failed to unmarshal JSONB value:", value))
 	}