docs: cut the v3.4.0 release

Author: Tinsh

CHANGELOG-3.4.md

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+# [3.4.0](https://github.com/kilofox/kohana/compare/v3.3.6...v3.4.0) (2018-12-25)
+
+
+### Bug Fixes
+
+* fix incompatible exception handling with PHP 7 ([24cbefa](https://github.com/kilofox/kohana/commit/24cbefa))
+* **Userguide:** change the data type of Kohana_Kodoc_Markdown::$_toc to array ([58f7aef](https://github.com/kilofox/kohana/commit/58f7aef))
+
+
+### Features
+
+* isolate the visible part of an application inside a public directory ([9b794b9](https://github.com/kilofox/kohana/commit/9b794b9))
+* **Auth:** remove hash_password() method ([2c974aa](https://github.com/kilofox/kohana/commit/2c974aa))
+* **Cache:** add Memcached driver ([b7287ed](https://github.com/kilofox/kohana/commit/b7287ed))
+* **Cache:** deprecate the APC and Memcache drivers ([55c0690](https://github.com/kilofox/kohana/commit/55c0690))
+* **Cache:** deprecate the MemcacheTag driver ([4cfb5f5](https://github.com/kilofox/kohana/commit/4cfb5f5))
+* **Core:** deprecate Kohana::CODENAME constant ([8e07900](https://github.com/kilofox/kohana/commit/8e07900))
+* **Database:** remove MySQL driver ([428ec22](https://github.com/kilofox/kohana/commit/428ec22))
+* **Encrypt:** deprecate the Mcrypt driver ([a5f5456](https://github.com/kilofox/kohana/commit/a5f5456))
+* **Encrypt:** separate Mcrypt from Encrypt as a driver and implement OpenSSL driver ([bee97eb](https://github.com/kilofox/kohana/commit/bee97eb))
+* **Security:** remove strip_image_tags() method ([9846cde](https://github.com/kilofox/kohana/commit/9846cde))
+* **Validation:** remove as_array() method ([92964d3](https://github.com/kilofox/kohana/commit/92964d3))
+