Use a newline when appending to .bashrc

[89465127]

If a user has no newline at the end of their .bashrc, the export LESS command will end up appended to an existing line, and won't work.

Instead of:

echo export LESS=-RFX >> ~/.bashrc

try:

printf '\nexport LESS=-RFX\n' >> ~/.bashrc

similar to the way it's done here:

https://github.com/andsens/homeshick#installation