Rack 1.6.2 and 1.5.4 have been released!

Hi Everybody!

I've released Rack 1.6.2 and 1.5.4. These releases contain a fix for a potential
DoS attack, and you can read about it here:

* [CVE-2015-3225](https://groups.google.com/forum/#!topic/ruby-security-ann/gcUbICUmKMc)

The commits for rack 1.5.4 can be found [here](https://github.com/rack/rack/compare/1.5.3...1.5.4)
The commits for rack 1.6.2 can be found [here](https://github.com/rack/rack/compare/1.6.1...1.6.2)

Digests for the gems are:

[aaron@TC dist]$ shasum *
d71ea9c90d7ef2a0787722f233da8fcbfb5e55d5  rack-1.5.4.gem
85d34dbf068cda5cf36432984da8ccf81c3d1be5  rack-1.6.2.gem

Thanks, and have a happy Tuesday!!!

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