Update .travis.yml

Author: benmarwick

.travis.yml

@@ -9,7 +9,7 @@ matrix:
     - os: osx
       language: r
       cache: packages
-      
+     
 
 env:
  global:
@@ -18,6 +18,8 @@ env:
 warnings_are_errors:  false
 
 before_install:
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then curl -sfL 'https://api.github.com/repos/jgm/pandoc/releases/tags/2.0' | jq -r -e '.assets[] | select(.name | test("pkg$"))| .browser_download_url'
+https://github.com/jgm/pandoc/releases/download/2.0/pandoc-2.0-macOS.pkg ; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew tap caskroom/fonts  ; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew cask install font-eb-garamond font-source-code-pro font-lato  ; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then sudo tlmgr update --self  ; fi