Update README.md
Update README.md
Fixes #2020 - Race Condition in UIImageView+AFNetworking when called twice with the same URL
[Issue #2032] Documenting change in behavior of NSOutputStream property
Merge branch 'master' of github.com:AFNetworking/AFNetworking
[Issue #2032] Only nil out outputStream property of connection operation if responseData is non-nil, meaning that no custom  was set
closes #2035
Update adn leaf cert
Merge pull request #2042 from carsonmcdonald/adncertupdate

Update adn leaf cert
Import UIRefreshControl+AFNetworking
Support NSSecureCoding in AFURLResponseSerialization
Support CGFLOAT_IS_DOUBLE  in AFImageResponseSerializer
[AFHTTPResponseSerializer] Use copy to ensure immutable types
Merge pull request #2045 from BB9z/UIRefreshControl

Import UIRefreshControl+AFNetworking
[Issue #2015][Issue #2040] Define AF_Require_noErr macro, to avoid compiler warning for __Require_noErr
Changing security policy to none, while new example endpoint is considered
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Merge pull request #2037 from timbrah/master

closes #2035
Fixing image loading for the Mac OS X example app
Merge branch 'master' of github.com:AFNetworking/AFNetworking