Merge pull request #6576 from ellemouton/paymentAddrBuildRouteFlag

lncli: add payment-addr flag to buildroute

docs/release-notes/release-notes-0.15.0.md

@@ -72,6 +72,9 @@ releases. Backward compatibility is not guaranteed!
   caveats/restrictions to be added to an existing macaroon (instead of needing
   to bake a new one). 
 
+* [Add `payment_addr` flag to `buildroute`](https://github.com/lightningnetwork/lnd/pull/6576)
+  so that the mpp record of the route can be set correctly.
+
 ## Neutrino
 
 [Neutrino now suports BIP