fix attribute

openproject-video_wiki_macro.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
 
   s.email = "ryanlee@zepheira.com"
   s.homepage = "http://zepheira.com"
-  s.licneses = ["BSD"]
+  s.licenses = ["BSD"]
   s.rubygems_version = "2.2.2"
   s.summary = "OpenProject Video Wiki Macro"