fix(deps): update esprima to 4.0.0

closes #667

Author: JeroenVinke

package.json

@@ -31,7 +31,7 @@
     "aurelia-dependency-injection": "^1.0.0",
     "aurelia-logging": "^1.2.0",
     "aurelia-polyfills": "^1.0.0",
-    "esprima": "^3.1.3",
+    "esprima": "^4.0.0",
     "glob": "^7.1.1",
     "npm": "^3.10.8",
     "preprocess": "^3.1.0",