Update onchange requirement from 6.0.0 to 6.1.0

Updates the requirements on [onchange](https://github.com/Qard/onchange) to permit the latest version.
- [Release notes](https://github.com/Qard/onchange/releases)
- [Commits](Qard/onchange@v6.0.0...v6.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -31,7 +31,7 @@
     "jest": "24.9.0",
     "jsdoc": "3.6.3",
     "jshint": "2.10.2",
-    "onchange": "6.0.0",
+    "onchange": "6.1.0",
     "prettier": "1.18.2"
   }
 }