migrate from govendor to dep

vendor/github.com/go-sql-driver/mysql/const.go

@@ -9,8 +9,7 @@
 package mysql
 
 const (
-	defaultMaxAllowedPacket = 4 << 20 // 4 MiB
-	minProtocolVersion      = 10
+	minProtocolVersion byte = 10
 	maxPacketSize           = 1<<24 - 1
 	timeFormat              = "2006-01-02 15:04:05.999999"
 )
@@ -88,10 +87,8 @@ const (
 )
 
 // https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnType
-type fieldType byte
-
 const (
-	fieldTypeDecimal fieldType = iota
+	fieldTypeDecimal byte = iota
 	fieldTypeTiny
 	fieldTypeShort
 	fieldTypeLong
@@ -110,7 +107,7 @@ const (
 	fieldTypeBit
 )
 const (
-	fieldTypeJSON fieldType = iota + 0xf5
+	fieldTypeJSON byte = iota + 0xf5
 	fieldTypeNewDecimal
 	fieldTypeEnum
 	fieldTypeSet