.travis.yml in textbringer-0.1.7 vs .travis.yml in textbringer-0.1.8

@@ -1,16 +1,33 @@
 sudo: false
+os:
+  - linux
+  - osx
 language: ruby
 rvm:
-- 2.3.3
-- 2.4.0
+  - 2.3.3
+  - 2.4.0
+  - ruby-head
+matrix:
+  allow_failures:
+    - os: osx
+    - rvm: ruby-head
+  fast_finish: true
 cache: bundler
 script:
-- xvfb-run bundle exec rake test
-- bundle exec bundle-audit check --update
+  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then
+        xvfb-run bundle exec rake test;
+    else
+        bundle exec rake test;
+    fi
+  - bundle exec bundle-audit check --update
 env:
   global:
     UPLOAD_TO_CODECOV: 1
 notifications:
   email:
     on_success: never
     on_failure: always
+addons:
+  apt:
+    packages:
+      - xclip