update donations.txt encoding to utf-8

 Donations ordered by first donation.
 
-* [2014-04-25 13:21] 刘连响     刘连响<notedit@gmail.com>
-* [2014-04-25 13:25] 张瑞圣     大圣(5839109)
-* [2014-04-25 13:31] 郭强       寒一冰(63395865)
-* [2014-05-12 10:22] 陈晨       陈晨<undeadalpha@gmail.com>
+* [2014-04-25 13:21] 刘连响     刘连响<notedit@gmail.com>
+* [2014-04-25 13:25] 张瑞圣     大圣(5839109)
+* [2014-04-25 13:31] 郭强       寒一冰(63395865)
+* [2014-05-12 10:22] 陈晨       陈晨<undeadalpha@gmail.com>