install readline for rpy2

Tim Hopper · Tim Hopper · commit dc28d61c1541 · 2018-10-18T17:33:16.000Z
diff --git a/.travis/install_conda.sh b/.travis/install_conda.sh
@@ -5,5 +5,5 @@ hash -r
 $HOME/miniconda/bin/conda config --set always_yes yes --set changeps1 no
 $HOME/miniconda/bin/conda update -q conda
 $HOME/miniconda/bin/conda info -a
-$HOME/miniconda/bin/conda install --quiet pip
+$HOME/miniconda/bin/conda install --quiet pip readline
 $HOME/miniconda/bin/conda install --quiet --channel r mro-base r-ggplot2
