Bump rsvp from 4.7.0 to 4.8.4 (#7)

Bumps [rsvp](https://github.com/tildeio/rsvp.js) from 4.7.0 to 4.8.4.
- [Release notes](https://github.com/tildeio/rsvp.js/releases)
- [Changelog](https://github.com/tildeio/rsvp.js/blob/master/CHANGELOG.md)
- [Commits](tildeio/rsvp.js@v4.7.0...v4.8.4)

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

yarn.lock

@@ -1744,8 +1744,8 @@ rsvp@^3.3.3:
   resolved "https://registry.yarnpkg.com/rsvp/-/rsvp-3.6.2.tgz#2e96491599a96cde1b515d5674a8f7a91452926a"
 
 rsvp@^4.7.0:
-  version "4.7.0"
-  resolved "https://registry.yarnpkg.com/rsvp/-/rsvp-4.7.0.tgz#dc1b0b1a536f7dec9d2be45e0a12ad4197c9fd96"
+  version "4.8.4"
+  resolved "https://registry.yarnpkg.com/rsvp/-/rsvp-4.8.4.tgz#b50e6b34583f3dd89329a2f23a8a2be072845911"
 
 run-async@^2.2.0:
   version "2.3.0"