Add 'literal-string' as a basic StringType()

Author: craigfrancis

src/PhpDoc/TypeNodeResolver.php

@@ -146,6 +146,9 @@ private function resolveIdentifierTypeNode(IdentifierTypeNode $typeNode, NameSco
 			case 'string':
 				return new StringType();
 
+			case 'literal-string':
+				return new StringType();
+
 			case 'class-string':
 				return new ClassStringType();