Doc: v5.3.1 release-notes.

doc/release-notes/release-notes-5.3.1.md

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+PIVX Core version v5.3.1 is now available from: https://github.com/pivx-project/pivx/releases
+
+This is an important release for stakers and Masternodes: including several tier two synchronization, GUI and build system bug fixes.
+We recommend everyone to update your node/wallet.
+
+Please report bugs using the issue tracker at github: https://github.com/pivx-project/pivx/issues
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely shut down, then run the installer (on Windows) or just copy over /Applications/PIVX-Qt (on Mac) or pivxd/pivx-qt (on Linux).
+
+Notable Changes
+==============
+
+### GUI
+
+* Duplicate transaction records bug fixed.
+* Not visible shield and/or cold staking contacts addresses list bug fixed
+
+### Tier Two Network
+
+* Not advancing (stalled) tier two synchronization bug fixed.
+* Spork signer not persisting new spork value to DB bug fixed.
+
+### Build system
+
+* "dirty" release build version name bug fixed.
+
+5.3.1 Change log
+==============
+
+### GUI
+- #2530 [GUI][BUG] remove duplicated coll. confirmation check in MNModel::data (random-zebra)
+- #2491 [GUI] Translation cleanup (Fuzzbawls)
+- #2551 [BUG][GUI] Fix random double/triple transaction record issue (random-zebra)
+- #2557 [Trivial] Update labelSubtitleAddress text in send widget ui (random-zebra)
+- #2555 [GUI] Fix not visible contacts list for shield/CS addrs (furszy)
+
+### Consensus
+- #2562 [Consensus] Add checkpoints before v5.3.1 release (random-zebra)
+
+### Tier Two Network
+- #2553 [BUG] Spork signer doesn't persist new spork value to DB (random-zebra)
+- #2559 [BUG][TierTwo] Clear fulfilled requests when mnsync fails (random-zebra)
+- #2560 [Bug][TierTwo] Mark peer sync request msg fulfilled only if the broadcast was performed (furszy)
+
+### Build system
+- #2525 [Build] Get rid of CLIENT_DATE (furszy)
+- #2541 [Gitian][Bug] Ignore changes to relic_conf.h.in (Fuzzbawls) 
+- #2546 [Snap] Fix nightly build's genbuild.sh patch (Fuzzbawls)
+
+### RPC
+- #2540 [RPC][Doc] Fix RPC/cli example in setautocombinethreshold help (random-zebra)
+
+## Credits
+
+Thanks to everyone who directly contributed to this release:
+
+- furszy
+- Fuzzbawls
+- random-zebra
+- W. J. van der Laan
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/pivx-project-translations/), the QA team during Testing and the node hosts supporting our Testnet.