fix(relationships): fix unhandled promise rejection warning

Author: digitalsadhu

lib/relationships.js

@@ -41,9 +41,8 @@ module.exports = function (app, options) {
       id = ctx.result.data.id
       data = options.data
       model = utils.getModelFromContext(ctx, app)
-      return relationships(model, id, data)
-        .then(() => next())
-        .catch(err => next(err))
+      relationships(model, id, data).then(() => next()).catch(err => next(err))
+      return
     }
 
     next()