Fall out of tabComplete when only a single completion candidate exists
Fall out of tabComplete when only a single completion candidate exists

If the completer only returns a single word, then return from tab
completion at that point and complete the line with the single
completion candidate.

mvo5/liner,glycerine/liner,platinasystems/liner,moander/liner,Cofyc/liner,PLWagner/golang-liner,go-delve/liner