Add dependencies for testing the activerecord provider

Author: cbeer

ruby-oai.gemspec

@@ -15,6 +15,8 @@ Gem::Specification.new do |s|
     s.add_dependency('faraday')
     s.add_dependency('faraday_middleware')
     s.add_development_dependency('rake')
+    s.add_development_dependency('activerecord')
+    s.add_development_dependency('sqlite3')
     s.add_development_dependency('rdoc')
 
     s.files = %w(README.md Rakefile) +