Update README.md

Author: qintonguav

README.md

@@ -1,5 +1,5 @@
 # VINS-Fusion
-## Visual-INertial State Estimator
+## An optimization-based multi-sensor state estimator
 
 <img src="https://github.com/HKUST-Aerial-Robotics/VINS-Fusion/blob/master/support_files/image/vins_logo.png" width = 55% height = 55% div align=left />
 <img src="https://github.com/HKUST-Aerial-Robotics/VINS-Fusion/blob/master/support_files/image/kitti.png" width = 34% height = 34% div align=center />
@@ -11,7 +11,7 @@ VINS-Fusion is an optimization-based multi-sensor state estimator, which achieve
 - online temporal calibration (time offset between camera and IMU)
 - visual loop closure
 
-**Authors:** [Tong Qin](http://www.qintonguav.com), Peiliang Li, Shaozu Cao, Jie Pan, Zhenfei Yang, and [Shaojie Shen](http://www.ece.ust.hk/ece.php/profile/facultydetail/eeshaojie) from the [Aerial Robotics Group](http://uav.ust.hk/), [HKUST](https://www.ust.hk/)
+**Authors:** [Tong Qin](http://www.qintonguav.com), Peiliang Li, Shaozu Cao, Jie Pan, and [Shaojie Shen](http://www.ece.ust.hk/ece.php/profile/facultydetail/eeshaojie) from the [Aerial Robotics Group](http://uav.ust.hk/), [HKUST](https://www.ust.hk/)
 
 **Videos:**