add missing charsets

Author: svang-bf

tornado_mysql/charset.py

@@ -249,6 +249,14 @@ def by_name(self, name):
 _charsets.add(Charset(241, 'utf8mb4', 'utf8mb4_esperanto_ci', ''))
 _charsets.add(Charset(242, 'utf8mb4', 'utf8mb4_hungarian_ci', ''))
 _charsets.add(Charset(243, 'utf8mb4', 'utf8mb4_sinhala_ci', ''))
+_charsets.add(Charset(244, 'utf8mb4', 'utf8mb4_german2_ci', ''))
+_charsets.add(Charset(245, 'utf8mb4', 'utf8mb4_croatian_ci', ''))
+_charsets.add(Charset(246, 'utf8mb4', 'utf8mb4_unicode_520_ci', ''))
+_charsets.add(Charset(247, 'utf8mb4', 'utf8mb4_vietnamese_ci', ''))
+_charsets.add(Charset(248, 'gb18030', 'gb18030_chinese_ci', 'Yes'))
+_charsets.add(Charset(249, 'gb18030', 'gb18030_bin', ''))
+_charsets.add(Charset(250, 'gb18030', 'gb18030_unicode_520_ci', ''))
+_charsets.add(Charset(255, 'utf8mb4', 'utf8mb4_0900_ai_ci', ''))
 
 
 charset_by_name = _charsets.by_name