relax nokogiri version restrictions (#58)

Author: westonganger

creek.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rspec', '~> 3.6.0'
   spec.add_development_dependency 'pry'
 
-  spec.add_dependency 'nokogiri', '~> 1.8.0'
-  spec.add_dependency 'rubyzip', '>= 1.2.1'
+  spec.add_dependency 'nokogiri', '>= 1.7.0'
+  spec.add_dependency 'rubyzip', '>= 1.0.0'
   spec.add_dependency 'httparty', '~> 0.15.5'
 end