Update:
I have added more ERC-20 tokens currently supporting:
ZRX, MKR, AE, BTM, BAT, HOT, REP, GNT, SNT, LINK, IOS, ELF, LOOM, Nuls, NAS, POWR, LRC, KNC, KIN, BIX, ENG, ENJ, SUB, POLY, CVC

With more on the way!
You can check currently supported tokens here: https://exchangedog.com/