Update README.rst
Add the CDS MOC Service to the list of astroquery available modules.
@@ -115,6 +115,7 @@ The following modules have been completed using a common API:
* `ALMA Archive <http://astroquery.readthedocs.io/en/latest/alma/alma.html>`_
* `Atomic Line List <http://astroquery.readthedocs.io/en/latest/atomic/atomic.html>`_: A collection of more than 900,000 atomic transitions.
* `Besancon <http://astroquery.readthedocs.io/en/latest/besancon/besancon.html>`_: Model of stellar population synthesis in the Galaxy.
+ * `CDS MOC Service <https://astroquery.readthedocs.io/en/latest/cds/cds.html>`_: A collection of all-sky survey coverage maps.
* `ESASky <http://astroquery.readthedocs.io/en/latest/esasky/esasky.html>`_: ESASky is a science driven discovery portal providing easy visualizations and full access to the entire sky as observed with ESA Space astronomy missions.
* `ESO Archive <http://astroquery.readthedocs.io/en/latest/eso/eso.html>`_
* `Gaia <http://astroquery.readthedocs.io/en/latest/gaia/gaia.html>`_: European Space Agency Gaia Archive.
