Add keysend feature bit to bolt 9

09-features.md

@@ -42,6 +42,12 @@ The Context column decodes as follows:
 | 22/23 | `option_anchors_zero_fee_htlc_tx` | Anchor commitment type with zero fee HTLC transactions   | IN       |                   | [BOLT #3][bolt03-htlc-tx], [lightning-dev][ml-sighash-single-harmful]|
 | 26/27 | `option_shutdown_anysegwit`         | Future segwit versions allowed in `shutdown`              | IN       |                   | [BOLT #2][bolt02-shutdown]   |
 
+
+## bLIP Reserved Feature Bits
+| Bits  | Name                             | Description                                               | Context  | Dependencies      | Link                                  |
+|-------|----------------------------------|-----------------------------------------------------------|----------|-------------------|---------------------------------------|
+| 55    | `keysend`                        | Node supports receiving keysend payments                  | N        |                   | [bLIP #0002][blip-0002]               |
+
 ## Requirements
 
 The origin node:
@@ -89,3 +95,4 @@ This work is licensed under a [Creative Commons Attribution 4.0 International Li
 [bolt07-query]: 07-routing-gossip.md#query-messages
 [bolt04-mpp]: 04-onion-routing.md#basic-multi-part-payments
 [ml-sighash-single-harmful]: https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-September/002796.html
+[blip-0002]: blips/blip-0002.mediawiki