Fix rasterio builds in docs (#1502)

* Rasterio version on RTD

* Temporarily unpin other packages

* Repin

Author: fmaussion

doc/environment.yml

@@ -12,9 +12,9 @@ dependencies:
   - dask=0.12.0
   - ipython=5.1.0
   - sphinx=1.5
-  - netCDF4=1.2.5
+  - netCDF4=1.2.9
   - hdf4=4.2.12  # temporary install to get netCD4 working (GH1106)
-  - cartopy=0.14.3
-  - rasterio=1.0a9
+  - cartopy=0.15.1
+  - rasterio=0.36.0
   - pip:
     - sphinx-gallery