Amend build instructions

Author: risteon

README.md

@@ -12,14 +12,17 @@
 * QT >= 5.2
 * OpenGL >= 3.3
 * [glow](https://github.com/jbehley/glow) (catkin package)
+* libmatio-dev
 
 ## Build
 
 On Ubuntu 16.04, most of the dependencies can be installed from the package manager:
 ```bash
-sudo apt install git libeigen3-dev libboost-all-dev qtbase5-dev libglew-dev catkin
+sudo apt install git libeigen3-dev libboost-all-dev qtbase5-dev libglew-dev catkin libmatio-dev
 ```
 
+Use a python-2 conda env.
+
 Additionally, make sure you have [catkin-tools](https://catkin-tools.readthedocs.io/en/latest/) and the [fetch](https://github.com/Photogrammetry-Robotics-Bonn/catkin_tools_fetch) verb installed:
 ```bash
 sudo apt install python-pip