update arxiv link

README.md

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  MAV application;               Mobile implementation (Video link for mainland China friends: [Video1](http://www.bilibili.com/video/av10813254/) [Video2](http://www.bilibili.com/video/av10813205/) [Video3](http://www.bilibili.com/video/av10813089/) [Video4](http://www.bilibili.com/video/av10813325/) [Video5](http://www.bilibili.com/video/av10813030/))
 
 **Related Papers**
-* **VINS-Mono: A Robust and Versatile Monocular Visual-Inertial State Estimator**, Tong Qin, Peiliang Li, Zhenfei Yang, Shaojie Shen [techincal report](https://github.com/HKUST-Aerial-Robotics/VINS-Mono/blob/master/support_files/paper/tro_technical_report.pdf) 
+* **VINS-Mono: A Robust and Versatile Monocular Visual-Inertial State Estimator**, Tong Qin, Peiliang Li, Zhenfei Yang, Shaojie Shen [arXiv:1708.03852](https://arxiv.org/abs/1708.03852v1) 
 * **Autonomous Aerial Navigation Using Monocular Visual-Inertial Fusion**, Yi Lin, Fei Gao, Tong Qin, Wenliang Gao, Tianbo Liu, William Wu, Zhenfei Yang, Shaojie Shen, J Field Robotics. 2017;00:1–29. [https://doi.org/10.1002/rob.21732](https://doi.org/10.1002/rob.21732)  
 ```
 @misc{vins-mono,