add Fira font to install

install.sh

@@ -53,6 +53,8 @@ if [ "${proceed}" = "Y" ] || [ "${proceed}" = "y" ] ; then
   # tmux
   install_package 'tmux' 'tmux: use powerline as status line' \
     && install_dotfile 'tmux.conf'
+
+  install_package 'fonts-firacode' 'firacode is a monospace font for developers'
 fi
 
 proceed=n