Set Bazel version tested in Travis CI to 0.15.0 (#1604)
Set Bazel version tested in Travis CI to 0.15.0 (#1604)


Xjs/rules_go,bazelbuild/rules_go,Xjs/rules_go,bazelbuild/rules_go,Xjs/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,Xjs/rules_go,Xjs/rules_go