add a changelog

Author: ManonMarchand

CHANGES.rst

@@ -21,6 +21,11 @@ hsa
 
 - New module to access ESA Herschel mission. [#2122]
 
+mocserver
+^^^^^^^^^
+
+- ``mocserver`` is the new name of the ``cds`` module allowing access to the CDS MOC server 
+
 esa.hubble
 ^^^^^^^^^^
 
@@ -95,6 +100,12 @@ casda
 - Use the standard ``login`` method for authenticating, which supports the system
   keyring [#2386]
 
+cds
+^^^
+
+the ``cds`` module has been renamed ``mocserver`` and issues a deprecation warning 
+when imported
+
 heasarc
 ^^^^^^^