ignition-gui3 3.0.0~pre1 (#900)
ignition-gui3 3.0.0~pre1 (#900)

* ignition-gui3: update 3.0.0~pre1

* ignition-gui3: update 3.0.0~pre1 bottle.

scpeters/homebrew-simulation,osrf/homebrew-simulation,j-rivero/homebrew-simulation