Add Woleet to members list

[gill3s]

Hello, we support Opentimestamps receipts download for timestamps since July 2018. We also support Chainpoint v2 just because JSON format is convenient and can be extended (as we did to support proof of signature) but not at all supporting the chainpoint network thingy with their scam ICO.

[RCasatta]

Hi @gill3s we require a backlink to opentimestamps.org to be added to the members list, see #2