Based on https://github.com/zendframework/zend-servicemanager/releases/tag/release-2.6.0 (commit 78209738bfce496908f324f4d926a134bbe762c6 in this repo)

Added
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- [zendframework/zend-servicemanager#4](https://github.com/zendframework/zend-servicemanager/pull/4) updates the
    `ServiceManager` to [implement the container-interop interface](https://github.com/container-interop/container-interop),
    allowing interoperability with applications that consume that interface.

Deprecated
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- Nothing.

Removed
-------

- Nothing.

Fixed
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- [zendframework/zend-servicemanager#3](https://github.com/zendframework/zend-servicemanager/pull/3) properly updates the
  codebase to PHP 5.5, by taking advantage of the default closure binding
  (`$this` in a closure is the invoking object when created within a method). It
  also removes several `@requires PHP 5.4.0` annotations.