release notes (#27)

Co-authored-by: Aaron Stannard <[email protected]>

RELEASE_NOTES.md

@@ -1,3 +1,20 @@
+#### 1.4.21 July 6 2021 ####
+**First official Release for Akka.Persistence.Linq2Db**
+
+Akka.Persistence.Linq2Db is an Akka.Net Persistence plug-in that is designed for both high performance as well as easy cross-database compatibility.
+
+There is a compatibility mode also available for those who wish to migrate from the existing Sql.Common journals.
+
+This release contains fixes for Transactions around batched writes, a fix for Sequence Number reading on Aggressive PersistAsync Usage, improved serialization/deserialization pipelines for improved write speed, and easier snapshot compatibility with Akka.Persistence.Sql.Common.
+
+We are still looking for community help with adding tests/configurations for MySql and Oracle, as well as trying out the new plugin and [providing feedback](https://github.com/akkadotnet/Akka.Persistence.Linq2Db/issues).
+
+[Please refer to the project page](https://github.com/akkadotnet/Akka.Persistence.Linq2Db/) for information on configuration.
+
+
+
+
+
 #### 0.90.1 Feb 3 2021 ####
 **Preview Release for Akka.Persistence.Linq2Db**