Adds changelog and gren support

Signed-off-by: Pasha Finkelshteyn <asm0dey@jetbrains.com>

Author: asm0dey

.gitignore

@@ -371,3 +371,5 @@ gradle-app.setting
 
 csvpath/
 orcpath/
+
+.env

.grenrc.yml

@@ -0,0 +1,5 @@
+---
+  dataSource: "commits"
+  prefix: ""
+  includeMessages: "commits"
+  changelogFilename: "CHANGELOG.md"

CHANGELOG.md

@@ -0,0 +1,25 @@
+# Changelog
+
+## n0.2.3 (23/06/2020)
+- [Updates version to 0.2.3](https://github.com/JetBrains/kotlin-spark-api/commit/91ee4faf392792642be5a8c58800b343df02da5b) - @asm0dey
+- [Fixes #21](https://github.com/JetBrains/kotlin-spark-api/commit/e8c1c5973087b3dd3f755d9d408893d3d2f19c94) - @asm0dey
+- [Updates kotest to 4.1.0 and moves it to property](https://github.com/JetBrains/kotlin-spark-api/commit/c26ad2e514421c4a1e8eaa10a76c035d8c0a0f11) - @asm0dey
+- [Fixes #20](https://github.com/JetBrains/kotlin-spark-api/commit/0b1bd9875cbb9ea85f1ccb66250d434ba5384c06) - @asm0dey
+- [Fixes #16](https://github.com/JetBrains/kotlin-spark-api/commit/875709459df946542bd133c2a3164deda5909fbc) - @asm0dey
+- [Bump kotest-assertions-core-jvm from 4.0.6 to 4.1.0](https://github.com/JetBrains/kotlin-spark-api/commit/b072f8fc2b4b30d40c8fee08f598941c896175bd) - @dependabot[bot]
+
+---
+
+## Fixes for #16 and #17 (22/06/2020)
+
+---
+
+## Fixes #15 (22/06/2020)
+
+---
+
+## Update to Spark 3.0.0 release (18/06/2020)
+
+---
+
+## 0.1.0 (01/06/2020)