Relax sqlite dependency

Author: cristianstu

jsonapi-rails.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'jsonapi-parser', '~> 0.1.0'
 
   spec.add_development_dependency 'rails', '~> 5.0'
-  spec.add_development_dependency 'sqlite3', '~> 1.4'
+  spec.add_development_dependency 'sqlite3', '~> 1.3'
   spec.add_development_dependency 'rake',        '~> 11.3'
   spec.add_development_dependency 'rspec-rails', '~> 3.5'
   spec.add_development_dependency 'with_model',  '~> 2.0'