Bump query-string from 6.8.3 to 6.9.0 (#47)

Bumps [query-string](https://github.com/sindresorhus/query-string) from 6.8.3 to 6.9.0.
- [Release notes](https://github.com/sindresorhus/query-string/releases)
- [Commits](https://github.com/sindresorhus/query-string/compare/v6.8.3...v6.9.0)

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

package.json

@@ -25,7 +25,7 @@
     "mobx": "^5.15.1",
     "mobx-react": "^6.1.4",
     "prop-types": "^15.6.2",
-    "query-string": "^6.2.0",
+    "query-string": "^6.9.0",
     "react": "^16.12.0",
     "react-dom": "^16.8.0",
     "react-select": "^3.0.4",