Use PSR coding standards

Author: madrussa

src/Kitar/Dynamodb/Model/Model.php

@@ -110,7 +110,7 @@ public static function find($key)
         }
 
         if (is_string($key) || is_numeric($key)) {
-            $model = new static;
+            $model = new static();
             $model->setAttribute($model->getKeyName(), $key);
             $key = $model->getKey();
         }

src/Kitar/Dynamodb/Query/Builder.php

@@ -14,7 +14,6 @@
 
 class Builder extends BaseBuilder
 {
-
     /**
      * Name of the index.
      * @var string|null
@@ -125,7 +124,7 @@ public function __construct(Connection $connection, Grammar $grammar, Processor
 
         $this->processor = $processor;
 
-        $this->expression_attributes = $expression_attributes ?? new ExpressionAttributes;
+        $this->expression_attributes = $expression_attributes ?? new ExpressionAttributes();
 
         if (! $is_nested_query) {
             $this->initializeDedicatedQueries();