Added entry in docs/interface-CHANGELOG.md file

docs/interface-CHANGELOG.md

@@ -5,6 +5,23 @@ team.  See [consensus
 CHANGELOG](../ouroboros-consensus/docs/interface-CHANGELOG.md) file for how
 this changelog is supposed to be used.
 
+## Circa 2022-05-23
+
+- redesign of `typed-protocols`.  Each pipelining client now tracks unsatisfied
+  transitions using a type level fifo. For example in the context of a simple
+  [`ping-poing` mini-protocol](https://input-output-hk.github.io/ouroboros-network/typed-protocols-examples/Network-TypedProtocol-PingPong-Type.html#t:PingPong)
+  if a pipelining clients sends two `MsgPing`, the queue will contain two yet
+  unsatisfied transitions `StBusy -> StIdle`.  They can be taken out of the
+  queue in a fifo order using one of the `Collect`, `CollectSTM`, `CollectDone`
+  primitives which usually are packaged.  In particular all pipelining clients
+  will need to be updated.
+
+- `Data.Type.Nat` was moved from `typed-protocols` to `ouroboros-network` package.
+
+- Pipeliend decisions are still using `Nat` singletons; one needs
+  `Data.Type.Nat.queueDepthNat` or `Data.Type.Nat.queueFDepthNat` to transform
+  one of the `Queue` singletons to a `Nat`.
+
 ## Circa 2022-05-19
 
 - removed `node-to-client` versions `1` to `8`.  The lowest supported version is
@@ -18,7 +35,6 @@ this changelog is supposed to be used.
 - `typed-protocols`, `typed-protocols-cborg` and `typed-protocols` were moved
   to https://github.com/input-output-hk/typed-protocols
 
-
 ## Circa 2022-04-06
 
 - removed `node-to-node` versions `1` to `6`.  The lowest supported version is