* `Result<(), ChannelMonitorUpdateErr>` return values have been replaced with
a `ChannelMonitorUpdateStatus` trinary enum. This better denotes that
`ChannelMonitorUpdateStatus::InProgress` is not an error, but asynchronous
persistence of a monitor update. Note that asynchronous persistence still
has some edge cases and is not yet recommended for production (#1106).
* `ChannelMonitor` persistence failure no longer automatically broadcasts the
latest commitment transaction. See the
`ChannelMonitorUpdateStatus::PermanentFailure` docs for more info (#1106).
* `*Features::known` has been replaced with individual
`*MessageHandler::provided_*_features` methods (#1707).
* `OnionMessenger` now takes a `CustomOnionMessageHandler` implementation,
allowing you to send and receive custom onion messages (#1748).
* `ProbabilisticScorer` now tracks the historical distribution of liquidity
estimates for channels. See new `historical_*` parameters in
`ProbabilisticScoringParameters` for more details (#1625).
* `lightning-block-sync`'s `BlockSource` trait now supports BIP 157/158
filtering clients by returning only header data for some blocks (#1706).
* `lightning-invoice`'s `Router` trait now accepts an `InFlightHtlcs` to
ensure we do not over-use a remote channel's funds during routing (#1694).
Note that this was previously backported to 0.0.111 for bindings users.
* `NetworkGraph::remove_stale_channels` has been renamed
`NetworkGraph::remove_stale_channels_and_tracking` as `NetworkGraph` now
refuses to re-add nodes and channels that were recently removed (#1649).
* The `lightning-rapid-gossip-sync` crate now supports `no-std` (#1708).
* The default `ProbabilisticScoringParameters::liquidity_offset_half_life` has
been increased to six hours from one (#1754).
* All commitment transaction building logic for anchor outputs now assumes the
no-HTLC-tx-fee variant (#1685).
* A number of missing `Eq` implementations were added (#1763).
Bug Fixes
=========
* `lightning-background-processor` now builds without error with the `futures`
feature (#1744).
* `ChannelManager::get_persistable_update_future`'s returned `Future` has been
corrected to not fail to be awoken in some cases (#1758).
* Asynchronously performing the initial `ChannelMonitor` persistence is now
safe (#1678).
* Redundantly applying rapid gossip sync updates no longer `Err`s (#1764).
* Nodes which inform us via payment failures that they should no longer be
used are now removed from the network graph. Some LND nodes spuriously
generate this error and may remove themselves from our graph (#1649).
In total, this release features 134 files changed, 6598 insertions, 4370
deletions in 109 commits from 13 authors, in alphabetical order:
* Duncan Dean
* Elias Rohrer
* Gabriel Comte
* Gursharan Singh
* Jeffrey Czyz
* Jurvis Tan
* Matt Corallo
* Max Fang
* Paul Miller
* Valentine Wallace
* Viktor Tigerström
* Wilmer Paulino
* acid-bit
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