(improvement)(project) Upgrade Maven version to 0.8.4-SNAPSHOT and add changelog. (#674)

CHANGELOG.md

@@ -4,6 +4,14 @@
 - "Breaking Changes" describes any changes that may break existing functionality or cause
   compatibility issues with previous versions.
 
+## SuperSonic [0.8.4] - 2024-01-19
+
+### Added
+- support creating derived metrics.
+  - Support creating metrics using three methods: by measure, metric, and field expressions.
+- added support for postgresql data source.
+- code adjustment and abstract optimization for chat and headless.
+
 ## SuperSonic [0.8.2] - 2023-12-18
 
 ### Added

pom.xml

@@ -64,7 +64,7 @@
         <xk.time.version>3.2.4</xk.time.version>
         <mockito-inline.version>4.5.1</mockito-inline.version>
         <jsqlparser.version>4.5</jsqlparser.version>
-        <revision>0.8.2-SNAPSHOT</revision>
+        <revision>0.8.4-SNAPSHOT</revision>
         <!-- Do not bump spotless plugin version since 2.30.0 is the latest version supports Java 8-->
         <maven.plugin.spotless.version>2.30.0</maven.plugin.spotless.version>
         <spotless.python.includes></spotless.python.includes>