Add dot-notation in docs and changelog

Author: Art4

CHANGELOG.md

@@ -5,6 +5,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased][]
 
+### Added
+
+- Dot-notation support in `AccessInterface::has()` and `AccessInterface::get()`
+
 ## [0.4] - 2015-09-01
 
 ### Added

README.md

@@ -14,7 +14,7 @@ Format: [JSON API 1.0](http://jsonapi.org/format/1.0/)
 
 * [x] Be 100% JSON API 1.0 spec conform
 * [x] Handle/validate a server response body
-* [ ] Offer an easy way to retrieve the data
+* [x] Offer an easy way to retrieve the data
 * [x] Be extendable and allow injection of classes/models
 * [ ] Offer access to included resources through identifier
 * [ ] Handle/validate a client request body
@@ -41,9 +41,9 @@ $manager = new \Art4\JsonApiClient\Utils\Manager();
 
 $document = $manager->parse($jsonapi_string);
 
-if ($document->has('meta') and $document->get('meta')->has('info'))
+if ($document->has('meta.info'))
 {
-    echo $document->get('meta')->get('info'); // "Testing the JSON API Client."
+    echo $document->get('meta.info'); // "Testing the JSON API Client."
 }
 
 // List all keys

docs/objects-introduction.md

@@ -65,6 +65,20 @@ This returns:
 bool(true)
 ```
 
+The `has()` method has support for dot-notated keys:
+
+```php
+var_dump($document->has('meta.info'));
+var_dump($document->has('jsonapi.version'));
+```
+
+This returns:
+
+```php
+bool(true)
+bool(false)
+```
+
 ### Get the keys of all existing values
 
 You can get the keys of all existing values using the `getKeys()` method. Assume we have the same `$document` like in the last example.
@@ -102,6 +116,18 @@ $meta = $document->get('meta');
 
 > **Note:** Using `get()` on a non-existing value will throw an [Exception\AccessException](exception-introduction.md#exceptionaccessexception). Use `has()` or `getKeys()` to check if a value exists.
 
+The `get()` method has support for dot-notated keys:
+
+```php
+var_dump($document->get('meta.info'));
+```
+
+This returns:
+
+```php
+string(28) "Testing the JSON API Client."
+```
+
 ### Get the containing data as array
 
 You can get all data as an array using the `asArray()` method.