Fixing broken build for 0.8

Author: vladar

src/Error.php

@@ -0,0 +1,18 @@
+<?php
+namespace GraphQL;
+
+trigger_error(
+    'GraphQL\Error was moved to GraphQL\Error\Error and will be deleted on next release',
+    E_USER_DEPRECATED
+);
+
+
+/**
+ * Class Error
+ *
+ * @deprecated as of 8.0 in favor of GraphQL\Error\Error
+ * @package GraphQL
+ */
+class Error extends \GraphQL\Error\Error
+{
+}

src/deprecated.php

@@ -4,7 +4,6 @@
 }
 
 // Renamed as of 8.0:
-class_alias('GraphQL\Error\Error', 'GraphQL\Error');
 class_alias('GraphQL\Error\FormattedError', 'GraphQL\FormattedError');
 class_alias('GraphQL\Error\SyntaxError', 'GraphQL\SyntaxError');