update xray dep

Author: Steve Pascoe

package.json

@@ -1,6 +1,6 @@
 {
   "name": "loopback-connector-postgresql",
-  "version": "3.9.0-4",
+  "version": "3.9.0-5",
   "description": "Loopback PostgreSQL Connector",
   "engines": {
     "node": ">=8"
@@ -21,7 +21,7 @@
   },
   "dependencies": {
     "async": "^0.9.0",
-    "aws-xray-sdk": "^2.5.0",
+    "aws-xray-sdk": "^3.0.0-alpha.1",
     "bluebird": "^3.4.6",
     "chalk": "^3.0.0",
     "debug": "^4.1.1",