Update version to 0.2.1 (#899)

Author: rhugonnet

setup.cfg

@@ -1,7 +1,7 @@
 [metadata]
 author = xDEM developers
 name = xdem
-version = 0.2.0
+version = 0.2.1
 description = Analysis of digital elevation models and elevation point clouds
 keywords = dem, elevation, geoutils, xarray
 long_description = file: README.md