Bump rollbar from 3.5.1 to 3.5.2

Bumps [rollbar](https://github.com/rollbar/rollbar-gem) from 3.5.1 to 3.5.2.
- [Release notes](https://github.com/rollbar/rollbar-gem/releases)
- [Changelog](https://github.com/rollbar/rollbar-gem/blob/master/CHANGELOG.md)
- [Commits](rollbar/rollbar-gem@v3.5.1...v3.5.2)

---
updated-dependencies:
- dependency-name: rollbar
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -226,7 +226,7 @@ GEM
       actionpack (>= 5.2)
       railties (>= 5.2)
     rexml (3.2.6)
-    rollbar (3.5.1)
+    rollbar (3.5.2)
     rspec-core (3.13.0)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.0)