Merge pull request #368 from theist/patch-1

Notify deploy only on primary :rollbar_role server

lib/rollbar/tasks/rollbar.cap

@@ -6,7 +6,7 @@ namespace :rollbar do
 
   desc 'Send the deployment notification to Rollbar.'
   task :deploy do
-    on roles fetch(:rollbar_role) do
+    on primary fetch(:rollbar_role) do
       warn("You need to upgrade capistrano to '>= 3.1' version in order to correctly report deploys to Rollbar. (On 3.0, the reported revision will be incorrect.)") if Capistrano::VERSION =~ /^3\.0/
 
       uri    = URI.parse 'https://api.rollbar.com/api/1/deploy/'