chore(package): update loopback-boot to version 2.28.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "husky": "0.14.1",
     "loglevel": "1.4.1",
     "loopback": "3.8.0",
-    "loopback-boot": "2.25.0",
+    "loopback-boot": "2.28.0",
     "loopback-component-explorer": "4.2.0",
     "loopback-component-fixtures": "1.1.0",
     "loopback-context": "1.0.0",