Incorrect Base Orientation for Go1 robot

[nickioan]

Hi it appears that the orientation for the "trunk" on the Unitree Go1 robot is not correct. I believe the issue stems from the trunk.dae file in its respective meshes folder. I was able to fix it for my case by directly editing the urdf file of its child joints, but I thought it might be worth pointing out for future releases.

[jhwangbo]

thx for pointing it out. I'll fix for the next push