Merge pull request #711 from srobo/dependabot/bundler/concurrent-ruby-1.3.7

Bump concurrent-ruby from 1.3.4 to 1.3.7

Author: PeterJCLaw

Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     addressable (2.9.0)
       public_suffix (>= 2.0.2, < 8.0)
     colorator (1.1.0)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.7)
     csv (3.3.0)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)