README.md: update to TIP version

Author: LynnHo

README.md

@@ -4,7 +4,7 @@
 
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-# <p align="center"> [AttGAN](https://ieeexplore.ieee.org/document/8718508?source=authoralert) <br> <font size=4> [TIP Nov. 2019](https://ieeexplore.ieee.org/document/8718508?source=authoralert), [arXiv Nov. 2017](https://arxiv.org/pdf/1711.10678v1.pdf) </font> </p>
+# <p align="center"> [AttGAN](https://ieeexplore.ieee.org/document/8718508?source=authoralert) <br> <sub><sub> [TIP Nov. 2019](https://ieeexplore.ieee.org/document/8718508?source=authoralert), [arXiv Nov. 2017](https://arxiv.org/pdf/1711.10678v1.pdf) </sub></sub> </p>
 
 **TensorFlow** implementation of **AttGAN**: Facial Attribute Editing by Only Changing What You Want