Specify sqlite3 version so CI runs

Author: krasnoukhov

jsonapi-utils.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.10'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rails', ENV['RAILS_VERSION'] || '~> 5.1'
-  spec.add_development_dependency 'sqlite3'
+  spec.add_development_dependency 'sqlite3', '~> 1.3.6'
   spec.add_development_dependency 'rspec-rails', '~> 3.1'
   spec.add_development_dependency 'factory_girl', '~> 4.8'
   spec.add_development_dependency 'smart_rspec', '~> 0.1.6'