travis-ci: disable Mac build

mariusae · web-flow · commit c8154fda5c9c · 2019-10-07T10:44:30.000-07:00
The grailbio/testutil is consistently producing checksum errors on Travis's CI setup;
hard to replicate outside.
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,6 @@ go:
   - 1.12.x
 os:
   - linux
-  - osx
 dist: trusty
 sudo: false
 install: true
