.travis.yml in pivotal_to_pdf-1.3.3 vs .travis.yml in pivotal_to_pdf-1.3.4

@@ -1,4 +1,3 @@
 script: "cp .pivotal.yml.sample .pivotal.yml; PIVOTAL_TO_PDF_CONFIG_DIR=. bundle exec rake spec"
 rvm:
   - 1.9.3
-  - ree