v0.6.4

Maintenance release which upgrades nim-libp2p and the primitives we use from it (logos-storage-dht-nim does not use libp2p) and ships Nim mcp support as a goodie. Should remain protocol-compatible with previous versions.

What's Changed

• chore: add nim mcp by @2-towns in #117
• chore: update libp2p version by @2-towns in #116

Full Changelog: v0.6.3...v0.6.4