optimize summary for Bihari languages

#17

Author: tinohager

src/Nager.Country.Translation/LanguageCode.cs

@@ -66,7 +66,7 @@ public enum LanguageCode
         /// </summary>
         BG,
         /// <summary>
-        /// Bihari languages
+        /// Bihari languages (deprecated)
         /// </summary>
         BH,
         /// <summary>