Fixed incompatibility with updated mediawiki api dependency

Gopkg.toml

@@ -27,7 +27,7 @@
 
 [[constraint]]
   name = "github.com/sadbox/mediawiki"
-  version = "0.1.0"
+  version = "v0.1"
 
 [prune]
   go-tests = true

wikiauth.go

@@ -23,7 +23,10 @@ func (wikiAuth *WikiAuth) Login(username, password string) error {
 		return err
 	}
 
-	err = client.Login(username, password)
+	client.Username = username
+	client.Password = password
+
+	err = client.Login()
 	if err != nil {
 		return err
 	}