* 5.2.2.2 fixes these security problems:
CVE-2019-5418
CVE-2019-5419
CVE-2019-5420
## Rails 5.2.3 (March 27, 2019) ##
* Allow using combine the Cache Control `public` and `no-cache` headers.
Before this change, even if `public` was specified for Cache Control header,
it was excluded when `no-cache` was included. This fixed to keep `public`
header as is.
Fixes#34780.
*Yuji Yaginuma*
* Allow `nil` params for `ActionController::TestCase`.
*Ryo Nakamura*
## Rails 5.2.2.1 (March 11, 2019) ##
* No changes.
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