add v0.1.0 to the changelog

Author: Chilipp

CHANGELOG.md

@@ -7,3 +7,11 @@ SPDX-License-Identifier: CC0-1.0
 # Changelog
 
 ## v0.1.0: Initial release
+
+The first official release that implements various plot methods, in particular
+
+- `psyplot.project.plot.vertical_transect`
+- `psyplot.project.plot.vertical_maptransect`
+- `psyplot.project.plot.horizontal_maptransect`
+- `psyplot.project.plot.horizontal_mapvectortransect`
+- `psyplot.project.plot.horizontal_mapcombinedtransect`