release_notes: delete old release notes and add instruction

It can be confusing to have multiple sets of release notes tracked in
this doc. Remove already released versions and update instructions.

release_notes.md

@@ -7,7 +7,10 @@ This file tracks release notes for the loop client.
 
 ### Release Manager: 
 * All of the items under the "Next Release" heading should be included in the release notes.
-* As part of the PR that bumps the client version, the "Next Release" heading should be replaced with the release version including the changes.
+* As part of the PR that bumps the client version, cut everything below the 'Next Release' heading. 
+* These notes can either be pasted in a temporary doc, or you can get them from the PR diff once it is merged. 
+* The notes are just a guideline as to the changes that have been made since the last release, they can be updated.
+* Once the version bump PR is merged and tagged, add the release notes to the tag on GitHub.
 
 ## Next release
 
@@ -31,44 +34,3 @@ This file tracks release notes for the loop client.
 #### Breaking Changes
 
 #### Bug Fixes
-
-## 0.10.0
-
-#### New Features
-
-* Multi-path payment has been enabled for Loop In. This means that it is now possible
-  to replenish multiple channels via a single Loop In request and a single on-chain htlc.
-  This has to potential to greatly reduce chain fee costs. Note that it is not yet possible
-  to select specific peers to loop in through.
-* The daemon now sends a user agent string with each swap. This allows
-  developers to identify their fork or custom implementation of the loop client.
-
-##### Updated Swap Suggestions
-* The swap suggestions endpoint has been updated to be fee-aware. Swaps that 
-  exceed the fee limits set by the liquidity manager will no longer be 
-  suggested (see `getParams` for the current limits, and use `setParams` to 
-  update these values). 
-* Swap suggestions are now aware of ongoing and previously failed swaps. They 
-  will not suggest swaps for channels that are currently being utilized for 
-  swaps, and will not suggest any swaps if a swap that is not limited to a 
-  specific peer or channel is ongoing. If a channel was part of a failed swap 
-  within the last 24H, it will be excluded from our swap suggestions (this 
-  value is configurable).
-* The `debug` logging level is recommended if using this feature.
-
-#### Breaking Changes
-
-* Macaroon authentication has been enabled for the `loopd` gRPC and REST
-  connections. This makes it possible for the loop API to be exposed safely over
-  the internet as unauthorized access is now prevented.
-  
-  The daemon will write a default `loop.macaroon` in its main directory. For
-  mainnet this file will be picked up automatically by the `loop` CLI tool. For
-  testnet you need to specify the `--network=testnet` flag.
-  [More information about TLS and macaroons.](README.md#authentication-and-transport-security)
-
-* The `setparm` loopcli endpoint is renamed to `setrule` because this endpoint 
-  is only used for setting liqudity rules (parameters can be set using the new 
-  `setparams` endpoint).
-
-#### Bug Fixes