Update release-notes

Author: codablock

doc/release-notes.md

@@ -233,6 +233,7 @@ modules were reorganized in separate folders to make navigation through code a b
 
 See detailed [set of changes](https://github.com/dashpay/dash/compare/v0.14.0.5...dashpay:v0.15.0.0).
 
+- [`3c055bf79`](https://github.com/dashpay/dash/commit/3c055bf79) Bump nMinimumChainWork and defaultAssumeValid (#3336)
 - [`9d5c3d12e`](https://github.com/dashpay/dash/commit/9d5c3d12e) Try to actually accept newly created dstx-es into masternode's mempool (#3332)
 - [`f23e722da`](https://github.com/dashpay/dash/commit/f23e722da) Switch CLIENT_VERSION_IS_RELEASE to `true` for v0.15 (#3306)
 - [`b57f1dac8`](https://github.com/dashpay/dash/commit/b57f1dac8) Update release notes