* Update PGFPlotsX colorbar_titel map to ylabel
For most of the backends supported by Polts.jl the `colorbar_title` attribute maps to the attribute in the backend that ultimately is displayed on the vertical axis of the colorbar, which is vertically aligned. Not for PGFPlotsX as in this backend the `title` attribute is displayed on top of the colorbar while the `ylabel` is shown on the vertical bar.
* Update .zenodo.json
added my name to the contributors list