--- /dev/null
+CHANGELOG
+=========
+
+2.8.0
+-----
+
+The edge case of defining just one value for nodes of type Enum is now allowed:
+
+```php
+$rootNode
+ ->children()
+ ->enumNode('variable')
+ ->values(array('value'))
+ ->end()
+ ->end()
+;
+```
+
+Before: `InvalidArgumentException` (variable must contain at least two
+distinct elements).
+After: the code will work as expected and it will restrict the values of the
+`variable` option to just `value`.
+
+ * deprecated the `ResourceInterface::isFresh()` method. If you implement custom resource types and they
+ can be validated that way, make them implement the new `SelfCheckingResourceInterface`.
+ * deprecated the getResource() method in ResourceInterface. You can still call this method
+ on concrete classes implementing the interface, but it does not make sense at the interface
+ level as you need to know about the particular type of resource at hand to understand the
+ semantics of the returned value.
+
+2.7.0
+-----
+
+ * added `ConfigCacheInterface`, `ConfigCacheFactoryInterface` and a basic `ConfigCacheFactory`
+ implementation to delegate creation of ConfigCache instances
+
+2.2.0
+-----
+
+ * added ArrayNodeDefinition::canBeEnabled() and ArrayNodeDefinition::canBeDisabled()
+ to ease configuration when some sections are respectively disabled / enabled
+ by default.
+ * added a `normalizeKeys()` method for array nodes (to avoid key normalization)
+ * added numerical type handling for config definitions
+ * added convenience methods for optional configuration sections to ArrayNodeDefinition
+ * added a utils class for XML manipulations
+
+2.1.0
+-----
+
+ * added a way to add documentation on configuration
+ * implemented `Serializable` on resources
+ * LoaderResolverInterface is now used instead of LoaderResolver for type
+ hinting