20220608
Update for FW 2.3.1 release
Single return parsing updated to match FW 2.3.1
Please note that this will be the last release to support Python 3.6, Ubuntu 16.04, and ROS kinetic.
This will also be the last release to support any FW under FW 2.0.
Additionally, future versions of the Ouster SDK will require C++ 14.
See CHANGELOG.rst for details