Review: Mention hyperledger-labs#240 Allocation helpers

Author: matthiasgeihs

CHANGELOG.md

@@ -18,7 +18,7 @@ Reorg-resistance for the Ethereum backend and support for external Watchtowers.
 
 - :arrow_up: Update go to v1.17 and go-ethereum to v1.10.8.
 - :white_check_mark: Extend support for additional blockchain backends by revising the generic tests (e.g., [#225], [#227], [#228]).
-- :children_crossing: Improve usability (e.g., [#124], [#144], [#196], [#204]).
+- :children_crossing: Improve usability (e.g., [#124], [#144], [#196], [#204], [#240]).
 
 ### Fixed
 - :bug: Improve stability (e.g., [#129], [#134], [#148], [#191], [#207], [#218]).
@@ -288,3 +288,4 @@ Initial release.
 [#196]: https://github.com/hyperledger-labs/go-perun/pull/196
 [#207]: https://github.com/hyperledger-labs/go-perun/pull/207
 [#218]: https://github.com/hyperledger-labs/go-perun/pull/218
+[#240]: https://github.com/hyperledger-labs/go-perun/pull/240