Adds note about zend-crypt update to CHANGELOG

CHANGELOG.md

@@ -10,6 +10,9 @@ All notable changes to this project will be documented in this file, in reverse
   `Zend\Filter\FilterProviderInterface`, which can be used to provide
   configuration for the `FilterPluginManager` via zend-mvc `Module` classes.
 
+- [#61](https://github.com/zendframework/zend-filter/pull/61) adds support for
+  PHP 7.2.
+
 ### Deprecated
 
 - Nothing.
@@ -22,6 +25,14 @@ All notable changes to this project will be documented in this file, in reverse
 - [#61](https://github.com/zendframework/zend-filter/pull/61) removes support
   for HHVM.
 
+- [#61](https://github.com/zendframework/zend-filter/pull/61) removes support
+  for zend-crypt versions prior to 3.0. This was done as PHP deprecated the
+  mcrypt extension starting in PHP 7.1, and does not ship it by default
+  starting in PHP 7.2. zend-crypt 3.0 adds an OpenSSL adapter for its
+  BlockCipher capabilities, and acts as a polyfill for mcrypt usage. Since this
+  functionality has been used by default since 2.7.2, users should be able to
+  upgrade seamlessly.
+
 ### Fixed
 
 - Nothing.