Update LB connector version

Author: loay

package.json

@@ -23,7 +23,7 @@
     "async": "^0.9.0",
     "bluebird": "^3.4.6",
     "debug": "^2.1.1",
-    "loopback-connector": "^2.1.0",
+    "loopback-connector": "^3.0.0",
     "pg": "^6.0.0",
     "strong-globalize": "^2.6.2"
   },