Release notes 0.17.2

Bitcoin ABC version 0.17.2 is now available from:

https://download.bitcoinabc.org/0.17.2/

This release includes the following features and fixes: - Remove deprecated estimatepriority RPC. - Remove deprecated estimatesmartpriority RPC. - Remove support for -sendfreetransactions. - Remove unstable estimatesmartfee RPC. - Update berkley DB to 5.3 minimum. Developers should update their build environment accordingly. - Remove -incrementalrelayfee option