CHANGELOG-0.8: update

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

Author: gyuho

CHANGELOG-0.8.md

@@ -3,6 +3,23 @@
 <hr>
 
 
+## [v0.8.8](https://github.com/aws/aws-k8s-tester/releases/tag/v0.8.8) (2020-03-21)
+
+See [code changes](https://github.com/aws/aws-k8s-tester/compare/v0.8.7...v0.8.8).
+
+### `eks`
+
+- Fix [MNG security group creation](https://github.com/aws/aws-k8s-tester/commit/](https://github.com/aws/aws-k8s-tester/commit/210f3b91f7c953be08b46dce6e9e7f8e1cfdde03).).
+- Improve [MNG debugging](https://github.com/aws/aws-k8s-tester/commit/](https://github.com/aws/aws-k8s-tester/commit/210f3b91f7c953be08b46dce6e9e7f8e1cfdde03).).
+
+### Go
+
+- Compile with [*Go 1.14.1*](https://golang.org/doc/devel/release.html#go1.14).
+
+
+<hr>
+
+
 ## [v0.8.7](https://github.com/aws/aws-k8s-tester/releases/tag/v0.8.7) (2020-03-21)
 
 See [code changes](https://github.com/aws/aws-k8s-tester/compare/v0.8.6...v0.8.7).