docs: add missing refactor changelog entry

Author: mtrezza

changelogs/CHANGELOG_master.md

@@ -1,5 +1,10 @@
 ## [3.1.2](https://github.com/ParsePlatform/parse-dashboard/compare/3.1.1...3.1.2) (2021-10-04)
 
+
+### Refactor
+
+* upgrade react-router-dom from 5.2.1 to 5.3.0 ([#1817](https://github.com/ParsePlatform/parse-dashboard/pull/1817)) ([7ca6aae](https://github.com/ParsePlatform/parse-dashboard/commit/8f359b326dc69c7294ca8a208533cf58280357ad))
+
 ## [3.1.1](https://github.com/ParsePlatform/parse-dashboard/compare/3.1.0...3.1.1) (2021-09-30)