Update changelog with pull request number

Author: sequoiap

docs/changelog/0.2.0-changelog.md

@@ -21,7 +21,7 @@ until the version 1 is officially released.
 - Rebuilt device library to match new component implementations
 - Device library no long reads data files for s-parameters, as they've been 
     converted and are now stored as .npz files.
-- [#5](https://github.com/sequoiap/simphony/pull/5): ENHANCEMENT: Framework 
+- [#6](https://github.com/sequoiap/simphony/pull/6): ENHANCEMENT: Framework 
     rebuild, allows for easier implementation of custom component models and
     libraries.