Add changelog

Author: apeltzer

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### `Added`
 * [#127](https://github.com/nf-core/eager/pull/127) - Added a second testcase for testing the pipeline properly
 * [#129](https://github.com/nf-core/eager/pull/129) - Support BAM files as [input format](https://github.com/nf-core/eager/issues/41)
+* [#131](https://github.com/nf-core/eager/pull/131) - Support different [reference genome file extensions](https://github.com/nf-core/eager/issues/130)
 
 ### `Fixed`
 * [#128](https://github.com/nf-core/eager/issues/128) - Fixed reference genome handling errors