Added CHANGELOG for #8

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.
+
+## 3.0.0 - TBD
+
+### Added
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- [#8](https://github.com/zendframework/zend-config/pull/8) updates the
+  code base to work with the v3.0 version of zend-servicemanager. Primarily, this
+  involved:
+  - Updating the `AbstractConfigFactory` follow the new
+    `AbstractFactoryInterface` definition.
+  - Updating `ReaderPluginManager` and `WriterPluginManager` to follow the
+    changes to `AbstractPluginManager`. In particular, they now take their
+    `$invokableClasses` configuration and merge it with the incoming
+    configuration before delegating to the parent constructor.
+  - Updating `Factory` to pass an empty `ServiceManager` to the plugin managers
+    when lazy-loading them.