module declares its path as: xorm.io/core, but was required as: github.com/go-xorm/core

[yuikns]

Since project github.com/go-xorm/core has already updated (and the origin repository has been archived by the owner), we are required to update dependency of github.com/djwackey/gitea from github.com/go-xorm/core to xorm.io/core, otherwise we may meet an error :

 module declares its path as: xorm.io/core
                but was required as: github.com/go-xorm/core

And here is the pr in the upstream: djwackey/gitea#2

Besides, it would be great to add a go.mod file to this project.