Bump money gem dependency from 6.13 to 6.16

Author: alistairholt

money-rails.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
 
   s.require_path = "lib"
 
-  s.add_dependency "money",         "~> 6.13"
+  s.add_dependency "money",         "~> 6.16"
   s.add_dependency "monetize",      "~> 1.9"
   s.add_dependency "activesupport", ">= 3.0"
   s.add_dependency "railties",      ">= 3.0"