chore(package): update dependencies

Author: greenkeeper[bot]

package.json

@@ -35,11 +35,11 @@
     "type-is": "^1.6.14"
   },
   "devDependencies": {
-    "chai": "^3.3.0",
+    "chai": "^4.0.2",
     "coveralls": "^2.11.9",
     "istanbul": "^0.4.5",
-    "loopback": "^2.32.0",
-    "loopback-datasource-juggler": "^2.50.0",
+    "loopback": "^3.8.0",
+    "loopback-datasource-juggler": "^3.9.1",
     "mocha": "^3.0.2",
     "rsvp": "3.5.0",
     "semantic-release": "^6.3.2",