Created CHANGELOG for #20

Author: weierophinney

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file, in reverse chronological order by release.
+
+## 2.6.0 - TBD
+
+### Added
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- [#20](https://github.com/zendframework/zend-code/pull/20) updates
+  the zend-eventmanager dependency to `^2.6|^3.0`, and changes its
+  internal usage to use the `triggerEventUntil()` signature.