Update pg_query dependency

sqlint.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |s|
   s.rubygems_version = '1.8.23'
   s.summary = 'Simple SQL linter.'
 
-  s.add_runtime_dependency('pg_query', '~> 0.9.1')
+  s.add_runtime_dependency('pg_query', '~> 0.13.5')
   s.add_development_dependency('rake', '~> 10.1')
   s.add_development_dependency('rspec', '~> 3.2')
   s.add_development_dependency('bundler', '~> 1.3')