Consider new fields from hh_client --json --lint output as backward compatible

src/Linters/HHClientLintError.hack

@@ -26,6 +26,7 @@ final class HHClientLintError implements LintError {
     'bypass_changed_lines' => bool,
     'original' => string,
     'replacement' => string,
+    ...
   );
 
   public function __construct(

src/Linters/HHClientLinter.hack

@@ -63,6 +63,7 @@ final class HHClientLinter implements Linter {
   const type TJSONResult = shape(
     'errors' => vec<HHClientLintError::TJSONError>,
     'version' => string,
+    ...
   );
 
   private static function blameCode(