README uniform code style in example

Author: addshore

README.md

@@ -36,18 +36,18 @@ Here is a small usage example:
 
 ```php
 // Load everything
-require_once( __DIR__ . "/vendor/autoload.php" );
+require_once( __DIR__ . '/vendor/autoload.php' );
 
 // Initialise HTTP connection
 $api = new WikidataQueryApi( 'https://wdq.wmflabs.org/api' );
 
 // Build helper tools
 $wikidataQueryFactory = new WikidataQueryFactory( $api );
-$simpleQueryService = $wikidataQueryFactory->newSimpleQueryService());
+$simpleQueryService = $wikidataQueryFactory->newSimpleQueryService() );
 
 //Do a query that returns a list of ItemId
 //This query finds all the children (P40) of Charlemagne (Q3044)
 $itemIds = $simpleQueryService->doQuery(
-	new ClaimQuery(new PropertyId('P17'), new ItemId('Q3044'));
+	new ClaimQuery( new PropertyId( 'P17' ), new ItemId( 'Q3044' ) );
 );
 ```