GitlabAccessLevel => Add admin level

types/Gitlab/GitlabAccessLevel.ts

@@ -3,7 +3,8 @@ enum GitlabAccessLevel {
     REPORTER   = 20,
     DEVELOPER  = 30,
     MAINTAINER = 40,
-    OWNER      = 50
+    OWNER      = 50,
+    ADMIN      = 60
 }