Drop the slow macOS build

cbroglie · cbroglie · commit 9f1008ddb886 · 2019-10-30T14:14:28.000-07:00
It takes forever in Travis, and we have enough folks developing on
macOS so any regressions will be caught quickly.
diff --git a/.travis.yml b/.travis.yml
@@ -5,11 +5,6 @@ matrix:
   include:
     - go: 1.12.x
     - go: 1.13.x
-    - go: master
-      os: osx
-      env: BUILD_TAGS=
-  allow_failures:
-    - go: master
 
 # Install g++-4.8 to support std=c++11 for github.com/google/certificate-transparency/go/merkletree
 addons:
