Add Unsupported to known errors

Author: KurimuzonAkuma

compiler/errors/source/400_BAD_REQUEST.tsv

@@ -571,6 +571,7 @@ TTL_PERIOD_INVALID	The specified TTL period is invalid.
 TYPES_EMPTY	The types parameter is empty.
 TYPE_CONSTRUCTOR_INVALID	The type constructor is invalid.
 UNKNOWN_ERROR	Unknown error.
+UNSUPPORTED	This method is not supported.
 UNTIL_DATE_INVALID	That date parameter is invalid.
 URL_INVALID	The URL provided is invalid.
 USAGE_LIMIT_INVALID	The specified usage limit is invalid.