Update: version number for 3.1.0

assets @ 54f4e608

-Subproject commit bd1cb9cc99ab11ca13180ba5934b802058b6b308
+Subproject commit 54f4e608bd4a91ef5ed81b2f8e5778f4bf8632c5

pkg/conf/version.go

 package conf
 
 // BackendVersion 当前后端版本号
-var BackendVersion = "3.0.0-beta1"
+var BackendVersion = "3.1.0"
 
 // RequiredDBVersion 与当前版本匹配的数据库版本
-var RequiredDBVersion = "3.0.0-33-g5885661"
+var RequiredDBVersion = "3.1.0"
 
 // RequiredStaticVersion 与当前版本匹配的静态资源版本
-var RequiredStaticVersion = "3.0.0"
+var RequiredStaticVersion = "3.1.0"
 
 // IsPro 是否为Pro版本
 var IsPro = "false"