Adding a couple of places I forgot to update httparty

Author: ponny

url_shortener.gemspec

@@ -50,10 +50,10 @@ Gem::Specification.new do |s|
     s.specification_version = 2
 
     if Gem::Version.new(Gem::RubyGemsVersion) >= Gem::Version.new('1.2.0') then
-      s.add_runtime_dependency(%q<httparty>, ["~> 0.16.2"])
+      s.add_runtime_dependency(%q<httparty>, ["~> 0.21.0"])
       s.add_runtime_dependency(%q<hashie>, [">= 3.0", "< 5.0"])
     else
-      s.add_dependency(%q<httparty>, ["~> 0.16.2"])
+      s.add_dependency(%q<httparty>, ["~> 0.21.0"])
       s.add_dependency(%q<hashie>, [">= 3.0", "< 5.0"])
     end
   else