Update README.md

Author: zhongkaifu

README.md

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-Donate a beverage to help me to keep Seq2SeqSharp up to date :) [![Support via PayPal](https://www.paypalobjects.com/en_GB/i/btn/btn_donate_SM.gif)](https://www.paypal.me/fuzhongkai/)
+Donate a beverage to help me to keep Seq2SeqSharp up to date :) [![Support via PayPal](https://www.paypalobjects.com/en_GB/i/btn/btn_donate_SM.gif)](https://www.paypal.me/fuzhongkai/)  
+ 
 [Note: RNNSharp is in maintenance status and won't have new feature any more. For new neural network framework, please try Seq2SeqSharp (https://github.com/zhongkaifu/Seq2SeqSharp)]