changelog.md updated.

Signed-off-by: Pavel Erokhin (MairwunNx) <MairwunNx@gmail.com>

Author: MairwunNx

changelog.md

@@ -10,10 +10,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [1.15.2-1.0.1] - 2020-03-18
 
 ### Added
+- Project Essentials dependencies added to `build.gradle`.
 
 ### Changed
+- Kotlin version updated to `1.3.70`.
+- KotlinX serialization version updated to `0.20.0`. [Fixes crash on server startup]
 
 ### Removed
+- Essentials dependencies removed from `gradle.properties`.
 
 ## [1.15.2-1.0.0] - 2020-02-08