Fix R installation on Travis CI (#161)
Fix R installation on Travis CI (#161)

* Try to force R 3.5 installation

* yaml formatting

* With indent

* Try with conda

* Back to pining

* Use the new key, see https://rubuntu.netlify.com/post/changes-to-cran-ubuntu-webpage-regarding-apt-secure-key/

* Try with 3.6

* Clean up

reimandlab/Visualistion-Framework-for-Genome-Mutations,reimandlab/Visualisation-Framework-for-Genome-Mutations,reimandlab/Visualisation-Framework-for-Genome-Mutations,reimandlab/Visualistion-Framework-for-Genome-Mutations,reimandlab/Visualisation-Framework-for-Genome-Mutations,reimandlab/ActiveDriverDB,reimandlab/Visualisation-Framework-for-Genome-Mutations,reimandlab/Visualistion-Framework-for-Genome-Mutations,reimandlab/Visualistion-Framework-for-Genome-Mutations,reimandlab/ActiveDriverDB,reimandlab/ActiveDriverDB,reimandlab/Visualisation-Framework-for-Genome-Mutations,reimandlab/ActiveDriverDB