Bump rxjs from 6.5.2 to 6.5.3 (#214)

* Bump rxjs from 6.5.2 to 6.5.3

Bumps [rxjs](https://github.com/reactivex/rxjs) from 6.5.2 to 6.5.3.
- [Release notes](https://github.com/reactivex/rxjs/releases)
- [Changelog](https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/reactivex/rxjs/commits)

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

* Update rxjs version

Author: dependabot-preview[bot]

package-lock.json

@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "detect-browser": "^4.6.0",
-    "rxjs": "^6.5.2",
+    "rxjs": "^6.5.3",
     "semver-compare": "^1.0.0",
     "socket.io-client": "2.2.0"
   },
@@ -90,4 +90,4 @@
     "url": "https://github.com/arduino/arduino-create-agent-js-client/issues"
   },
   "homepage": "https://github.com/arduino/arduino-create-agent-js-client#readme"
-}
+}