Update dependency rollbar to v3.4.2

Author: renovate[bot]

Gemfile.lock

@@ -401,7 +401,7 @@ GEM
       netrc (~> 0.8)
     retriable (3.1.2)
     rexml (3.2.6)
-    rollbar (3.4.1)
+    rollbar (3.4.2)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)