Update dependency nodemon to v1.18.6

package.json

@@ -25,7 +25,7 @@
     "jsdoc": "3.5.5",
     "minami": "1.2.3",
     "mocha": "5.2.0",
-    "nodemon": "1.18.5"
+    "nodemon": "1.18.6"
   },
   "dependencies": {
     "babel-cli": "^6.26.0",