Update CHANGELOG.md

Author: observingClouds

CHANGELOG.md

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 * Add cloud droplet size distribution from specMACS instrument. By [Veronika Pörtge](https://github.com/vpoertge)
 * Add LICHT lidar data from RV Meteor as provided by the MPI-TCO catalog (#12). By [Leif Denby](https://github.com/leifdenby), [Hauke Schulz](https://github.com/observingClouds), [Tobias Kölling](https://github.com/d70-t) and [Nina Robbins](https://github.com/ninarobbins)
 ### Updated Datasets
+* Updated P3 W-Band radar dataset from version v1.0 to v2.0 (#166, #167). By [Hauke Schulz](https://github.com/observingClouds)
 * Updated variable type of `flag` in precipitation isotope dataset from BCO (#164). By [Hauke Schulz](https://github.com/observingClouds)
 * Updated RV Meteor cloud radar data (LIMRAD94) to version 1.2, in which the variable hydrometeor_mask was added which tells you whether there is a signal in the processed reflectivity or not
 * Add gridded POLDIRAD product with kerchunk references to provide a continous dataset (#160). By [Hauke Schulz](https://github.com/observingClouds)