Add ChangeLog for PHP_CodeCoverage 3.0

Author: sebastianbergmann

ChangeLog-3.0.md

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+# Changes in PHP_CodeCoverage 3.0
+
+All notable changes of the PHP_CodeCoverage 3.0 release series are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [3.0.0] - 2015-10-02
+
+### Removed
+
+* PHP_CodeCoverage is no longer supported on PHP 5.3, PHP 5.4, and PHP 5.5
+
+[3.0.0]: https://github.com/sebastianbergmann/php-code-coverage/compare/2.2...3.0.0
+