install pandoc

Author: nschloe

.travis.yml

@@ -19,6 +19,7 @@ before_install:
   - sudo apt update -qq
   - sudo apt-get -y install libcgal-dev libeigen3-dev swig python-numpy
   - sudo apt-get -y install libcgal-qt5-11  # bug in cgal, should be installed automatically
+  - sudo apt-get -y install pandoc
   - sudo pip install meshio
   - sudo pip install nose2