just linux - no longer using OSX - still have function in there if you want

.travis.yml

@@ -1,15 +1,10 @@
 language: R
 sudo: required
 cache: packages
-
-os: 
-  - linux
-  - osx
   
 before_install:
   - if [[ "${TRAVIS_OS_NAME}" = "osx" ]]; then brew cask install libreoffice ; fi  
   - if [[ "${TRAVIS_OS_NAME}" = "linux" ]]; then sudo apt-get update -y && sudo apt-get install libreoffice; fi
 
-
 after_success:
   - Rscript -e 'covr::codecov()'