Release notes 0.18.5

Bitcoin ABC version 0.18.5 is now available from:

https://download.bitcoinabc.org/0.18.5/

This release includes the following features and fixes: - Add the finalized block concept. Finalized blocks cannot be reorged, which protects the network against deep reorgs. - Add the -maxreorgdepth configuration to configure at what depth block are considered final. Default is 10. Use -1 to disable. - Introduce finalizeblock RPC to finalize a block at the will of the node operator. - Introduce a penalty to alternative chains based on the depth of the fork. This makes it harder for an attacker to do mid size reorg.