ignition-rendering2 2.4.0 (#1001)
ignition-rendering2 2.4.0 (#1001)

* ignition-rendering2: update 2.4.0
* ignition-rendering2: require mojave
    - There's something broken about opengl on high sierra.
* ignition-rendering2: update 2.4.0 bottle.

Co-authored-by: Steve Peters <19cdd629ec3b4ea4663c77a4169548f370fdc02f@openrobotics.org>
osrf/homebrew-simulation,scpeters/homebrew-simulation,j-rivero/homebrew-simulation