temporally specify a dependency to latest perfectqueue

UndefinedDecisionError is not an exception class breaks specs. treasure-data/perfectqueue@8eca4c1
treasure-data · Nov 30, 2015 · 9a1abc2 · 9a1abc2
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commit 9a1abc2
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diff --git a/Gemfile b/Gemfile
@@ -2,4 +2,5 @@ source 'https://rubygems.org'
 
 gemspec
 
+gem 'perfectqueue', github: 'treasure-data/perfectqueue', ref: '7dc0bb7'
 gem 'coveralls', require: false