Update README (#71)

Author: f3ath

README.md

@@ -27,22 +27,22 @@ A simple example to illustrate the general idea. This JSON representation from
     }
 }
 ```
-can be built with the following php code (less imports):
+can be built with the following php code:
 <!-- assert=output expect=my_json -->
 ```php
 <?php
-$articles = new \JsonApiPhp\JsonApi\Document\Resource\ResourceObject('articles', '1');
-$author = \JsonApiPhp\JsonApi\Document\Resource\Relationship::fromLinkage(
-    new \JsonApiPhp\JsonApi\Document\Resource\Linkage\SingleLinkage(
-        new \JsonApiPhp\JsonApi\Document\Resource\ResourceIdentifier('people', '9')
-    )
-);
+use \JsonApiPhp\JsonApi\Document;
+use \JsonApiPhp\JsonApi\Document\Resource\{
+    Linkage\SingleLinkage, Relationship, ResourceIdentifier, ResourceObject
+};
+
+$author = Relationship::fromLinkage(new SingleLinkage(new ResourceIdentifier('people', '9')));
 $author->setLink('self', '/articles/1/relationships/author');
-$author->setLink('related','/articles/1/author');
+$author->setLink('related', '/articles/1/author');
+$articles = new ResourceObject('articles', '1');
 $articles->setRelationship('author', $author);
 $articles->setAttribute('title', 'Rails is Omakase');
-$doc = \JsonApiPhp\JsonApi\Document::fromResource($articles);
-echo json_encode($doc, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
+echo json_encode(Document::fromResource($articles), JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
 ```
 
 Please refer to [the tests](./test) for the full API documentation: