Removed XRP/GBP and REP/CAD
Removed XRP/GBP and REP/CAD

These pairs are not supported anymore by Kraken.
https://github.com/timmolter/XChange/issues/1673
gaborkolozsy/XChange,timmolter/XChange,LeonidShamis/XChange,npomfret/XChange,andre77/XChange,nopy/XChange,Panchen/XChange,douggie/XChange,stachon/XChange,TSavo/XChange,chrisrico/XChange,ww3456/XChange,evdubs/XChange