Call for new DNS seed nodes, Mainnet and Testnet

[ardocrat]

@eravsar

should i force it to not include nodes older than a specific version?

Yes, its better to keep recent node versions, especially at seeds for better sync

@igno.peverell

2. Multiple additional Grin seeds with the following requirements:
   • Commit to maintain and upgrade Grin regularly for the next year at least.