Require zonefile

Author: dldinternet

fog-digitalocean.gemspec

@@ -56,6 +56,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'fog-xml',   '>= 0.1'
   s.add_dependency 'ipaddress', '>= 0.5'
   s.add_dependency 'activesupport', '~> 4.2'
+  s.add_dependency 'zonefile', '>= 1.04'
 
   s.files = `git ls-files`.split("\n")
   s.test_files = `git ls-files -- {spec,tests}/*`.split("\n")