Update module go-xorm/xorm to v0.7.9 (#17)

Author: renovate[bot]

go.mod

@@ -6,14 +6,14 @@ require (
 	github.com/denisenkom/go-mssqldb cfbb681360f0
 	github.com/go-sql-driver/mysql v1.4.1
 	github.com/go-xorm/builder v0.3.4 // indirect
-	github.com/go-xorm/xorm v0.7.1
+	github.com/go-xorm/xorm v0.7.9
 	github.com/joho/godotenv v1.3.0
 	github.com/lib/pq v1.2.0
 	github.com/mattn/go-sqlite3 v1.10.0
 	github.com/stretchr/testify v1.3.0
 	google.golang.org/appengine v1.6.1 // indirect
 )
 
-replace github.com/go-xorm/xorm => github.com/go-xorm/xorm v0.7.2-0.20190330194841-617e0ae295d7fd8a4ea48f6c782781f6cc367c7e
+replace github.com/go-xorm/xorm => github.com/go-xorm/xorm v0.7.9
 
 replace github.com/golang/lint => golang.org/x/lint v0.0.0-20190330180304-d0100b6