Add ChangeLog for PHPUnit 4.5

Author: sebastianbergmann

ChangeLog-4.5.md

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+# Changes in PHPUnit 4.5
+
+## PHPUnit 4.5.0
+
+* Added out-of-the-box support for [Prophecy](https://github.com/phpspec/prophecy)
+* Implemented [#137](https://github.com/sebastianbergmann/phpunit/issues/137): Add support for variable number of tests shown per line in default result printer
+* Merged [#1478](https://github.com/sebastianbergmann/phpunit/issues/1478): Improve the performance of `PHPUnit_Framework_Constraint_IsEqual` (which is used by `assertEquals()`, for instance) for the most common case
+* Fixed [#1474](https://github.com/sebastianbergmann/phpunit/issues/1474): Allow the registration of custom comparators for `assertEquals()` et al. (again)
+