docs(core): changelog for 2.4.0

core/.changelog.d/1167.changed

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-Support PIN of unlimited length.

core/.changelog.d/1249.added

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-Decred staking.

core/.changelog.d/1404.added

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-Locking the device by holding finger on the homescreen for 2.5 seconds.

core/.changelog.d/1491.changed

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-Allow decreasing the output value in RBF transactions.

core/.changelog.d/1502.changed

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-Cardano: Allow stake pool registrations with zero margin.

core/.changelog.d/1510.changed

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-Cardano: Assets are now shown as CIP-0014.

core/.changelog.d/1518.added

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-Public key to ECDHSessionKey.

core/.changelog.d/1540.added

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-Rust FFI for MicroPython.

core/.changelog.d/1554.changed

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-Random delays use ChaCha-based DRBG instead of HMAC-DRBG.

core/.changelog.d/1565.changed

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-Reduce memory fragmentation by clearing memory after every workflow.

core/.changelog.d/24.fixed

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-Import errors on T1 startup.

core/CHANGELOG.md

@@ -4,6 +4,28 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## 2.4.0 [24th May 2021]
+
+### Added
+- Decred staking.  [#1249]
+- Locking the device by holding finger on the homescreen for 2.5 seconds.  [#1404]
+- Public key to ECDHSessionKey.  [#1518]
+- Rust FFI for MicroPython.  [#1540]
+
+### Changed
+- Support PIN of unlimited length.  [#1167]
+- Allow decreasing the output value in RBF transactions.  [#1491]
+- Cardano: Allow stake pool registrations with zero margin.  [#1502]
+- Cardano: Assets are now shown as CIP-0014.  [#1510]
+- Random delays use ChaCha-based DRBG instead of HMAC-DRBG.  [#1554]
+- Reduce memory fragmentation by clearing memory after every workflow.  [#1565]
+- Update some FIDO icons.  [#1456]
+
+### Fixed
+- Import errors on T1 startup.  [#24]
+- Improve wording when showing multisig XPUBs.  [#1431]
+
+
 ## 2.3.6 [15th February 2021]
 
 ### Added
@@ -313,6 +335,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 - First public release.
 
+[#24]: https://github.com/trezor/trezor-firmware/issues/24
 [#379]: https://github.com/trezor/trezor-firmware/issues/379
 [#800]: https://github.com/trezor/trezor-firmware/issues/800
 [#948]: https://github.com/trezor/trezor-firmware/issues/948
@@ -338,6 +361,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 [#1139]: https://github.com/trezor/trezor-firmware/issues/1139
 [#1159]: https://github.com/trezor/trezor-firmware/issues/1159
 [#1165]: https://github.com/trezor/trezor-firmware/pull/1165
+[#1167]: https://github.com/trezor/trezor-firmware/issues/1167
 [#1173]: https://github.com/trezor/trezor-firmware/pull/1173
 [#1184]: https://github.com/trezor/trezor-firmware/issues/1184
 [#1188]: https://github.com/trezor/trezor-firmware/issues/1188
@@ -345,6 +369,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 [#1193]: https://github.com/trezor/trezor-firmware/issues/1193
 [#1206]: https://github.com/trezor/trezor-firmware/issues/1206
 [#1246]: https://github.com/trezor/trezor-firmware/issues/1246
+[#1249]: https://github.com/trezor/trezor-firmware/issues/1249
 [#1271]: https://github.com/trezor/trezor-firmware/issues/1271
 [#1292]: https://github.com/trezor/trezor-firmware/issues/1292
 [#1322]: https://github.com/trezor/trezor-firmware/issues/1322
@@ -355,5 +380,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 [#1384]: https://github.com/trezor/trezor-firmware/issues/1384
 [#1399]: https://github.com/trezor/trezor-firmware/issues/1399
 [#1402]: https://github.com/trezor/trezor-firmware/pull/1402
+[#1404]: https://github.com/trezor/trezor-firmware/issues/1404
 [#1415]: https://github.com/trezor/trezor-firmware/pull/1415
+[#1431]: https://github.com/trezor/trezor-firmware/pull/1431
+[#1456]: https://github.com/trezor/trezor-firmware/pull/1456
 [#1467]: https://github.com/trezor/trezor-firmware/issues/1467
+[#1491]: https://github.com/trezor/trezor-firmware/issues/1491
+[#1502]: https://github.com/trezor/trezor-firmware/issues/1502
+[#1510]: https://github.com/trezor/trezor-firmware/issues/1510
+[#1518]: https://github.com/trezor/trezor-firmware/issues/1518
+[#1540]: https://github.com/trezor/trezor-firmware/issues/1540
+[#1554]: https://github.com/trezor/trezor-firmware/issues/1554
+[#1565]: https://github.com/trezor/trezor-firmware/issues/1565