small updates

.travis.yml

@@ -42,8 +42,8 @@ jobs:
       script:
         - "travis_wait 120 sleep 7200 &"
         - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+        # Tag the image with a version such as vX.Y.Z,
         - docker build -t "$TRAVIS_REPO_SLUG":"$TRAVIS_TAG" . 1> /dev/null
-        # Tag the image with a version like v0.3.2, and create another tag for latest
         - docker push --all-tags "$TRAVIS_REPO_SLUG"
 
 after_success:

Dockerfile

@@ -6,8 +6,6 @@ RUN apt-get update
 # install dependencies needed for setting up R
 RUN apt-get install -y lsb-release dirmngr gnupg apt-transport-https ca-certificates software-properties-common
 RUN apt-get install -y libharfbuzz-dev libfribidi-dev
-
-# RUN apt-get -y build-dep libcurl4-gnutls-dev
 RUN apt-get -y install libcurl4-gnutls-dev
 
 # set up the key for adding the R repo