ReleaseTagService needs to require its dependency 'retries'

dor-services.gemspec

@@ -29,13 +29,12 @@ Gem::Specification.new do |s|
   s.add_dependency 'om', '~> 3.0'
   s.add_dependency 'rdf', '~> 1.1', '>= 1.1.7'
   s.add_dependency 'rest-client', '>= 1.7', '< 3'
+  s.add_dependency 'retries', '~> 0.0.5' # used by the release tag service
   s.add_dependency 'rsolr', '>= 1.0.3', '< 3'
   s.add_dependency 'ruby-cache', '~> 0.3.0'
   s.add_dependency 'rubydora', '~> 2.1'
   s.add_dependency 'solrizer', '~> 3.0'
   s.add_dependency 'systemu', '~> 2.6'
-  # s.add_dependency 'validatable', '~> 1.6.7'
-  s.add_dependency 'retries'
 
   # Stanford dependencies
   s.add_dependency 'dor-rights-auth', '~> 1.0', '>= 1.2.0'

lib/dor-services.rb

@@ -5,6 +5,7 @@
 require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/object/blank'
 require 'deprecation'
+require 'retries' # Used by Dor::ReleaseTagService
 
 module Dor
   extend ActiveSupport::Autoload

spec/spec_helper.rb

@@ -22,7 +22,6 @@
 require 'nokogiri'
 
 require 'support/dor_config'
-require 'retries'
 
 WebMock.disable_net_connect!(allow_localhost: true)
 Dor.logger.level = :error