fix(package): update path-to-regexp to version 4.0.4

Closes #37

Author: greenkeeper[bot]

package.json

@@ -131,7 +131,7 @@
     "typescript": "^3.0.3"
   },
   "dependencies": {
-    "path-to-regexp": "^3.0.0",
+    "path-to-regexp": "^4.0.4",
     "release-it": "^10.1.0"
   }
 }