Fix a typo in authors

Author: namanbansal

cyberSource_client.gemspec

@@ -8,7 +8,7 @@ Gem::Specification.new do |s|
   s.name        = "cybersource_rest_client"
   s.version     = "0.0.4"
   s.platform    = Gem::Platform::RUBY
-  s.authors     = ["CyuberSource"]
+  s.authors     = ["CyberSource"]
   s.email       = ["[email protected]"]
   s.homepage    = "https://developer.cybersource.com"
   s.summary     = "CyberSource Ruby SDK Gem"