Fixed unban method name

Author: Eternity-Yarr

library/src/main/java/com/pengrad/telegrambot/request/UnbanChatMember.java

@@ -0,0 +1,12 @@
+package com.pengrad.telegrambot.request;
+
+/**
+ * stas
+ * 5/2/16.
+ */
+public class UnbanChatMember extends KickChatMember {
+
+    public UnbanChatMember(Object chatId, int userId) {
+        super(chatId, userId);
+    }
+}