Travis testing attempt 3.3

.travis.yml

@@ -10,7 +10,6 @@ before_script:
 
 install:
   - sudo apt-get install -y r-base
-  - R -e 'install.packages(c( "rmarkdown"), repos = "http://cran.us.r-project.org")'
   - wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
   - bash miniconda.sh -b -p $HOME/miniconda
   - source "$HOME/miniconda/etc/profile.d/conda.sh"
@@ -25,6 +24,9 @@ install:
   - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION --file environment.yml
   - conda activate test-environment
 
+r_binary_packages:
+  - rmarkdown
+
 services: 
   - mysql