Add libraries to show_versions (#2321)

* Add dependencies to show_versions().

* DOC: Add libraries to dependency list.

* Undo adding of h5py to docs.

Author: tv3141

doc/installing.rst

@@ -31,6 +31,10 @@ For netCDF and IO
 - `PseudoNetCDF <http://github.com/barronh/pseudonetcdf/>`__: recommended
   for accessing CAMx, GEOS-Chem (bpch), NOAA ARL files, ICARTT files
   (ffi1001) and many other.
+- `rasterio <https://github.com/mapbox/rasterio>`__: for reading GeoTiffs and
+  other gridded raster datasets.
+- `iris <https://github.com/scitools/iris>`__: for conversion to and from iris'
+  Cube objects.
 
 For accelerating xarray
 ~~~~~~~~~~~~~~~~~~~~~~~

xarray/util/print_versions.py

@@ -79,6 +79,10 @@ def show_versions(as_json=False):
         ("h5py", lambda mod: mod.__version__),
         ("Nio", lambda mod: mod.__version__),
         ("zarr", lambda mod: mod.__version__),
+        ("cftime", lambda mod: mod.__version__),
+        ("PseudonetCDF", lambda mod: mod.__version__),
+        ("rasterio", lambda mod: mod.__version__),
+        ("iris", lambda mod: mod.__version__),
         ("bottleneck", lambda mod: mod.__version__),
         ("cyordereddict", lambda mod: mod.__version__),
         ("dask", lambda mod: mod.__version__),