bump to fog-core ~> 2.6 to get excon ~> 1.0

Author: geemus

fog-aws.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'shindo',  '~> 0.3'
 
   spec.add_dependency 'base64', '~> 0.2.0'
-  spec.add_dependency 'fog-core', '~> 2.1'
+  spec.add_dependency 'fog-core', '~> 2.6'
   spec.add_dependency 'fog-json', '~> 1.1'
   spec.add_dependency 'fog-xml', '~> 0.1'