haveno-ts-v0.0.20

What's Changed

• use OfferDirection enum instead of string by @woodser in #249
• update monero-ts to v0.9.4 by @woodser in #250
• rename grpc service clients from Monero to Xmr for consistency by @woodser in #252
• test buyer and seller payout tx fee and amount by @woodser in #253

Full Changelog: v0.0.19...v0.0.20