make fzf the default tab-completer.

many how-tos fail to mention that there is an additional ENV var that needs to be set in order to make fzf the default tab completer in bash. If this is not set, then the user has to do ** <TAB> in order to get fzf completions.

export FZF_COMPLETION_TRIGGER=''

put this in .bashrc before calling

export FZF_COMPLETION_TRIGGER=''