update nodemon to resolve npm security issue

Signed-off-by: Steven Esser <[email protected]>

Author: steven-esser

npm-shrinkwrap.json

@@ -36,7 +36,7 @@
     "jquery": "^3.1.0",
     "jsdom": "^9.4.1",
     "mocha": "^5.2.0",
-    "nodemon": "^1.18.4",
+    "nodemon": "^1.18.7",
     "sinon": "^1.17.4"
   },
   "dependencies": {