Update CHANGELOG.md

added change

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- `LigNetwork` now additionally displays percentage of interaction occurence.
 - `VdWContact` now accepts a `preset` parameter to easily use different van der Waals radii values:
   one of `mdanalysis` (default), `rdkit`, or `csd`.
 - `IFP.interactions()` iterator that yields all interaction data for a given frame in
@@ -323,4 +324,4 @@ tests.
 
 ## [0.2.1] - 2019-10-02
 
-Base version for this changelog
+Base version for this changelog