Add PR link to new CHANGELOG entries

Author: webmaster128

CHANGELOG.md

@@ -24,16 +24,17 @@ and this project adheres to
 - cosmwasm-std: Add `{CosmosMsg,SubMsg,Response}::change_custom` to change the
   custom message type ([#2099])
 - cosmwasm-std: Add `Uint{64,128,256,512}::panicking_add` and `::panicking_sub`
-  which are like the `Add`/`Sub` implementations but `const`.
+  which are like the `Add`/`Sub` implementations but `const`. ([#2098])
 - cosmwasm-std: Let `Timestamp::plus_nanos`/`::minus_nanos` use
-  `Uint64::panicking_add`/`::panicking_sub` and document panicking behaviour.
+  `Uint64::panicking_add`/`::panicking_sub` and document overflows. ([#2098])
 
 [#1983]: https://github.com/CosmWasm/cosmwasm/pull/1983
 [#2057]: https://github.com/CosmWasm/cosmwasm/pull/2057
 [#2058]: https://github.com/CosmWasm/cosmwasm/pull/2058
 [#2068]: https://github.com/CosmWasm/cosmwasm/pull/2068
 [#2075]: https://github.com/CosmWasm/cosmwasm/pull/2075
 [#2092]: https://github.com/CosmWasm/cosmwasm/pull/2092
+[#2098]: https://github.com/CosmWasm/cosmwasm/pull/2098
 [#2099]: https://github.com/CosmWasm/cosmwasm/pull/2099
 
 ### Changed