update changelog with kraken2

Author: maxibor

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 * [#326](https://github.com/nf-core/eager/pull/326) - Add Biopython and [xopen](https://github.com/marcelm/xopen/) dependencies
 * [#336](https://github.com/nf-core/eager/issues/336) - Change default Y-axis maximum value of DamageProfiler to 30% to match popular (but slower) mapDamage, and allow user to set their own value.
 * [#352](https://github.com/nf-core/eager/pull/352) - Add social preview image
+* [#355](https://github.com/nf-core/eager/pull/355) - Add Kraken2 metagenomics classifier
 
 ### `Fixed`