make coinvert accept GRC

[Erkan-Yilmaz]

People should contact them (tweets, email, ...) to bring attention to this.

mentioned in hangout 22:

related: #24 #31

[grctest]

Link: https://coinvert.io/

[droplister]

Coinvert is a scam. They use ShapeShift. They'll facilitate your small trades and then take your large ones. They'll tell you you'll get a refund in 48 hours and then it never comes and they stop replying. Avoid!

Happened to me. Here are other reports:
https://steemit.com/bitcoin/@anarchrysalis/my-awful-coinvert-experience
https://www.reddit.com/r/btc/comments/5wvv7g/coinvertio_scam_warning/

[grctest]

Thanks @droplister for providing this information, this is incredibly disappointing!

Let's find alternative platforms!