update changelog #25

input/pagecontent/changelog.md

@@ -12,6 +12,8 @@ All significant changes to this FHIR implementation guide will be documented on
 * [#19](https://github.com/ahdis/ch-elm/issues/19): Require DiagnosticReport.identifier (equal to Composition.identifier)
 * [#13](https://github.com/ahdis/ch-elm/issues/13): Update *Fig. 6: Resource Overview* with cardinalities
 * [#21](https://github.com/ahdis/ch-elm/issues/21): Usage of the IDN instead of the OASI for Patient.identifier Liechtenstein.
+* Add a computable way for the concept of leading code and in some cases necessary addition of additional codes to the leading code, see [Guidance - Laboratory Result](guidance.html#laboratory-result)
+   * [#25](https://github.com/ahdis/ch-elm/issues/25): Renaming of the specimen-specific ValueSet 'CH ELM Lab Specimen Types: Chlamydia Trachomatis' to ValueSet 'CH ELM Results Geni Spec'
 
 #### Fixed
 * [#9](https://github.com/ahdis/ch-elm/issues/9): Set minimum cardinality of Patient.gender to 1 (according to the logical model)