update goctl to go 1.16 for io/fs usage (#1571)

* update goctl to go 1.16 for io/fs usage

* feat: support pg serial type for auto_increment (#1563)

* add correct example for pg's url

* 🐞 fix: merge

* 🐞 fix: pg default port

* ✨ feat: support serial type

Co-authored-by: kurimi1 <d0n41df@gmail.com>

* chore: format code

Co-authored-by: toutou_o <33993460+kurimi1@users.noreply.github.com>
Co-authored-by: kurimi1 <d0n41df@gmail.com>

tools/goctl/api/parser/g4/ast/api.go

@@ -8,8 +8,10 @@ import (
 	"github.com/zeromicro/go-zero/tools/goctl/api/parser/g4/gen/api"
 )
 
-const prefixKey = "prefix"
-const groupKey = "group"
+const (
+	prefixKey = "prefix"
+	groupKey  = "group"
+)
 
 // Api describes syntax for api
 type Api struct {

tools/goctl/api/parser/g4/gen/api/apiparser_parser.go

@@ -634,4 +634,3 @@ func NewSyntaxLitContext(parser antlr.Parser, parent antlr.ParserRuleContext, in
 
 	return p
 }
-