Update setup.cfg (#766)

Author: adebardo

setup.cfg

@@ -1,7 +1,7 @@
 [metadata]
 author = xDEM developers
 name = xdem
-version = 0.1.6
+version = 0.1.7a1
 description = Analysis of digital elevation models (DEMs)
 keywords = dem, elevation, geoutils, xarray
 long_description = file: README.md