f - move NetworkGraph persistence to API Update

Author: jkczyz

CHANGELOG.md

@@ -41,6 +41,9 @@
    the connecting peer in the `init` message (#1326).
  * `ChannelManager::accept_inbound_channel` now takes a `user_channel_id`, which
    is used in a similar manner as in outbound channels. (#1381).
+ * `BackgroundProcessor` now persists `NetworkGraph` on a timer and upon
+   shutdown as part of a new `Persister` trait, which also includes
+   `ChannelManager` persistence (#1376).
  * `ProbabilisticScoringParameters` now has a `base_penalty_msat` option, which
    default to 500 msats. It is applied at each hop to help avoid longer paths
    (#1375).
@@ -72,9 +75,6 @@
  * Reduced time spent processing `channel_update` messages by checking
    signatures after checking if no newer messages have already been processed
    (#1380).
- * `BackgroundProcessor` now persists `NetworkGraph` on a timer and upon
-   shutdown as part of a new `Persister` trait, which also includes
-   `ChannelManager` persistence (#1376).
  * Fixed a few issues in `find_route` which caused preferring paths with a
    higher cost (#1398).
  * Fixed an issue in `ProbabilisticScorer` where a channel with not enough