lib/util/romaji_trx: add 〜 and ゟ

lib/util/romaji_transliteration.dart

@@ -205,7 +205,8 @@ const Map<String, String> hiragana_to_latin = {
   'ぉ': 'xo',
   'ゕ': 'xka',
   'ゖ': 'xke',
-  'ゎ': 'xwa'
+  'ゎ': 'xwa',
+  'ゟ': 'yori',
 };
 
 const Map<String, String> latin_to_hiragana = {
@@ -477,6 +478,7 @@ const Map<String, String> latin_to_hiragana = {
   '#,': '、',
   '#.': '。',
   '#/': '・',
+  '#~': '〜',
 };
 
 bool _smallTsu(String for_conversion) => for_conversion == hiragana_small_tsu;