Readme updated (#73)

* fix: mediator test

* docs: update No status message is sent on delivery request

---------

Co-authored-by: Shailesh Patil <shailesh.patil@iohk.io>
Co-authored-by: Shailesh Patil <53746241+mineme0110@users.noreply.github.com>
Signed-off-by: Shailesh <Patil>

README.md

@@ -51,7 +51,7 @@ The mediator is especially useful when the edge entities are not always online,
 - [DONE] `MediatorCoordination 2.0` - https://didcomm.org/mediator-coordination/2.0
  - See [link for the protocol specs](/Coordinate-Mediation-Protocol.md)
 - [TODO] `MediatorCoordination 3.0` - https://didcomm.org/mediator-coordination/3.0
-- [DONE] `Pickup 3` - https://didcomm.org/pickup/3.0
+- [DONE] `Pickup 3` - https://didcomm.org/pickup/3.0 [ with exclusion of When the delivery request  (https://didcomm.org/messagepickup/3.0/delivery-request)  is made, but there are no messages currently available to be sent,  No status message is sent immediately, Instead you can check the the status of message using the status request https://didcomm.org/messagepickup/3.0/status-request]
 - [DONE] `TrustPing 2.0` - https://didcomm.org/trust-ping/2.0/
 
 ## How to run