Move travis CI to use xcode 9 instead of 7.3#266

Merged

SeanCurtis-TRI merged 1 commit intoflexible-collision-library:masterfrom SeanCurtis-TRI:PR_advance_travis_ci_OSX

Aug 3, 2018

+2-2

Commits on Aug 2, 2018

Move travis CI to use xcode 9 instead of 7.3
SeanCurtis-TRI
committed