Install libedit-dev on Linux.

Author: brixen

.travis.yml

@@ -6,7 +6,7 @@ compiler:
 before_install:
 - echo $LANG
 - echo $LC_ALL
-- if [ $TRAVIS_OS_NAME == linux ]; then sudo apt-get update && sudo apt-get install -y llvm-3.6; fi
+- if [ $TRAVIS_OS_NAME == linux ]; then sudo apt-get update && sudo apt-get install -y libedit-dev llvm-3.6; fi
 - if [ $TRAVIS_OS_NAME == osx ]; then brew update && brew install llvm; fi
 - rvm use $RVM --install --binary --fuzzy
 - gem update --system