relax nokogiri dependency

Author: softbrada

hyp_diff.gemspec

@@ -20,6 +20,6 @@ HypDiff compares HTML snippets. It generates a diff between two input snippets.
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "nokogiri", "~> 1.6", ">= 1.6.5"
-  spec.add_dependency "diff-lcs", "~> 1.2", ">= 1.2.5"
+  spec.add_dependency "nokogiri"
+  spec.add_dependency "diff-lcs"
 end