fix go mod file

Author: lunny

go.mod

@@ -3,7 +3,6 @@ module github.com/jimmykuu/gopher
 go 1.12
 
 require (
-	gitea.com/lunny/tango v0.6.0
 	github.com/Unknwon/com v0.0.0-20190321035513-0fed4efef755 // indirect
 	github.com/Youngyezi/geetest v0.0.0-20180629105258-e3b16a2be0f4
 	github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a

go.sum

@@ -1,7 +1,5 @@
 gitea.com/lunny/log v0.0.0-20190322053110-01b5df579c4e h1:r1en/D7xJmcY24VkHkjkcJFa+7ZWubVWPBrvsHkmHxk=
 gitea.com/lunny/log v0.0.0-20190322053110-01b5df579c4e/go.mod h1:uJEsN4LQpeGYRCjuPXPZBClU7N5pWzGuyF4uqLpE/e0=
-gitea.com/lunny/tango v0.6.0 h1:Z9wX9fq5e2y9Da+cmlFpE3aAo1+GfTuhYIPPYdCD6kM=
-gitea.com/lunny/tango v0.6.0/go.mod h1:ebPnYxaYz9qzByTh3A7604q3tcj0QtATtdwvsAafswU=
 github.com/Unknwon/com v0.0.0-20190321035513-0fed4efef755 h1:1B7wb36fHLSwZfHg6ngZhhtIEHQjiC5H4p7qQGBEffg=
 github.com/Unknwon/com v0.0.0-20190321035513-0fed4efef755/go.mod h1:voKvFVpXBJxdIPeqjoJuLK+UVcRlo/JLjeToGxPYu68=
 github.com/Youngyezi/geetest v0.0.0-20180629105258-e3b16a2be0f4 h1:1Njrcys80BKBe9+Tn78lqhVJos0o6ol9z2gNKrAJiug=

main.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/jimmykuu/webhelpers"
 	"github.com/lunny/tango"
+	_ "github.com/shurcooL/vfsgen"
 	"github.com/tango-contrib/events"
 	"github.com/tango-contrib/renders"
 	"gopkg.in/mgo.v2"