ignition-physics2 2.0.0~pre1 (#909)
ignition-physics2 2.0.0~pre1 (#909)

* ignition-physics2: update 2.0.0~pre1

* fix tarball sha256

* ignition-physics2: update 2.0.0~pre1 bottle.

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