Fix travis

.travis.yml

@@ -21,7 +21,7 @@ before_install:
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9; fi
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo add-apt-repository -y "deb http://cran.rstudio.com/bin/linux/ubuntu $(lsb_release -s -c)/"; fi
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get update -qq -y; fi
-  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get install git libxml2-dev r-base r-base-dev r-recommended -y --allow-unauthenticated; fi
+  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get install git libxml2-dev libmagick++-dev r-base r-base-dev r-recommended -y --allow-unauthenticated; fi
 
   # osx
   # faster than using homebrew/science tap
@@ -30,7 +30,7 @@ before_install:
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then sudo installer -pkg R-*.pkg -target /; fi
 
   # both
-  - sudo R -e 'install.packages(c("ape", "rdiversity"), repos="http://cran.r-project.org")'
+  - sudo R -e 'install.packages(c("ape", "rdiversity"), repos="https://cran.r-project.org")'
 
 after_success:
   # linux