Update mail_room to 0.4.2 for better error handling

Gemfile

@@ -268,6 +268,6 @@ gem "newrelic_rpm"
 
 gem 'octokit', '3.7.0'
 
-gem "mail_room", "~> 0.4.1"
+gem "mail_room", "~> 0.4.2"
 
 gem 'email_reply_parser'

Gemfile.lock

@@ -370,7 +370,7 @@ GEM
       systemu (~> 2.6.2)
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
-    mail_room (0.4.1)
+    mail_room (0.4.2)
     method_source (0.8.2)
     mime-types (1.25.1)
     mimemagic (0.3.0)
@@ -805,7 +805,7 @@ DEPENDENCIES
   jquery-ui-rails
   kaminari (~> 0.15.1)
   letter_opener
-  mail_room (~> 0.4.1)
+  mail_room (~> 0.4.2)
   minitest (~> 5.3.0)
   mousetrap-rails
   mysql2
@@ -878,3 +878,6 @@ DEPENDENCIES
   virtus
   webmock (~> 1.21.0)
   wikicloth (= 0.8.1)
+
+BUNDLED WITH
+   1.10.5