removing extra white space at end of lines

cancan.gemspec

@@ -6,10 +6,10 @@ Gem::Specification.new do |s|
   s.homepage    = "http://github.com/ryanb/cancan"
   s.summary     = "Simple authorization solution for Rails."
   s.description = "Simple authorization solution for Rails which is completely decoupled from the user's roles. All permissions are stored in a single location for convenience."
-  
+
   s.files        = Dir["{lib,spec}/**/*", "[A-Z]*", "init.rb"]
   s.require_path = "lib"
-  
+
   s.rubyforge_project = s.name
   s.required_rubygems_version = ">= 1.3.4"
 end