Upgrade to loopback-connector@4.0.0

Author: jannyHou

package.json

@@ -23,7 +23,7 @@
     "async": "^1.5.0",
     "debug": "^2.2.0",
     "ibm_db": "^2.0.0",
-    "loopback-connector": "^3.0.0",
+    "loopback-connector": "^4.0.0",
     "strong-globalize": "^2.8.0"
   },
   "devDependencies": {