fix(loopback-boot): add support for es6 modules in boot scripts

Related: strongloop/loopback-boot#280

Author: klarkc

template/package.json

@@ -21,7 +21,7 @@
     "express": "^4.16.2",
     "express-history-api-fallback": "^2.2.1",
     "loopback": "^3.16.2",
-    "loopback-boot": "^3.1.0",
+    "loopback-boot": "github:klarkc/loopback-boot#master",
     "loopback-component-explorer": "^4.0.0",
     "serve-favicon": "^2.0.1",
     "strong-error-handler": "^2.0.0",