Add SwapSpace to the list of instant exchanges

[3lian]

Add SwapSpace to the list of instant exchanges
Link: https://swapspace.co/
Logo: https://matrix.decred.org:8448/_matrix/media/r0/download/decred.org/feLGiDmwHbILrxvZRKZDtBZM
SwapSpaceLogoBlack.svg.zip
Thanks!

[jzbz]

Put a hold on this I have a competing issue (#869).

[xaur]

#869 is closed, I guess this is no longer on hold?

@3lian if you're still around, does SwapSpace still have DCR? Is this issue still relevant?