fix(package): update nodemon to version 1.19.4

Closes #115

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "jsonwebtoken": "8.4.0",
     "mongoose": "5.5.13",
     "morgan": "1.9.1",
-    "nodemon": "1.19.1",
+    "nodemon": "1.19.4",
     "passport": "^0.4.0",
     "passport-jwt": "^4.0.0",
     "path": "^0.12.7",