refactor: rename to vanity url

app/msgbus/msgbus.graphqls

@@ -5,7 +5,7 @@ extend type Subscription {
     """after == 0 start from begining, after == -1 start from end"""
     postAdded(streamID: String! after: Int! = -1): PostEvent
 }
-type PostEvent implements Edge @goModel(model: "github.com/sour-is/ev/app/msgbus.PostEvent") {
+type PostEvent implements Edge @goModel(model: "go.sour.is/ev/app/msgbus.PostEvent") {
     id: ID!
 
     payload: String!