Add 2.0.4 release notes

doc/release-notes/release-notes-2.0.4.md

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+Raven Core version *2.0.4.0* is now available!!
+==============
+
+  <https://github.com/RavenProject/Ravencoin/releases/tag/v2.0.4>
+
+
+This is a major release containing bug fixes for 2.0.3.0.  It is highly recommended that users 
+upgrade to this version.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/RavenProject/Ravencoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://ravencoin.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the 
+installer (on Windows) or just copy over `/Applications/Raven-Qt` (on Mac)
+or `ravend`/`raven-qt` (on Linux).
+
+The first time you run version 2.0.4 or higher, your chainstate database may
+be converted to a new format, which will take anywhere from a few minutes to
+half an hour, depending on the speed of your machine.
+
+Downgrading warning
+==============
+
+The chainstate database for this release is not compatible with previous
+releases, so if you run 2.0.4 and then decide to switch back to any
+older version, you will need to run the old release with the `-reindex-chainstate`
+option to rebuild the chainstate data structures in the old format.
+
+If your node has pruning enabled, this will entail re-downloading and
+processing the entire blockchain.
+
+It is not recommended that users downgrade their version.  This version contains
+changes that *will* fork the chain, users not running 2.0.4 (or later) will be not
+be able to participate in this fork process and will be left on the old chain which 
+will not be valid.
+
+Compatibility
+==============
+
+Raven Core is extensively tested on multiple operating systems using
+the Linux kernel, macOS 10.8+, and Windows Vista and later. 32-bit versions of Windows,
+and Windows XP are not supported.
+
+Raven Core should also work on most other Unix-like systems but is not
+frequently tested on them.
+
+Notable changes
+==============
+
+- Fix testnet chain syncing.
+- Increase chaining depth.
+- Fix for -txindex after immediate BIP activation
+- Fix null pointer bug.
+- Fix qt amount formatting.
+- Python script for bulk issuance in assets/tools.
+- Python script for finding signed meta data.
+
+
+2.0.4.0-b175d7350 Change log
+==============
+
+Changelog available here: <https://github.com/RavenProject/Ravencoin/commits/release_2.0.4>
+
+Credits
+==============
+
+Thanks to everyone who directly contributed to this release:
+
+- Most importantly - The Raven Community!
+- Tron Black
+- Jesse Empey
+- Jeremy Anderson
+- Corbin Fox
+- Daben Steele
+- Cade Call
+- @Roshii
+- @underdarkskies
+- Mark Ney