DOC: adding changelog, as well as mention all modules that use regions

Author: bsipocz

CHANGES.rst

@@ -76,6 +76,7 @@ alma
 - New DataLink API handling. [#2493]
 - Fixed bug #2489 in which blank URLs were being sent to the downloader [#2490]
 - Removed deprecated broken functions from ``alma.utils``. [#2331]
+- Fixed a bug in slicing of ALMA regions. [#2810]
 
 astrometry_net
 ^^^^^^^^^^^^^^

astroquery/alma/utils.py

@@ -50,7 +50,12 @@ def footprint_to_reg(footprint):
     if footprint[:7] != 'Polygon' and footprint[:6] != 'Circle':
         raise ValueError("Unrecognized footprint type")
 
-    import regions
+    try:
+        import regions
+    except ImportError:
+        print('Could not import `regions`, which is required for the '
+              'functionality of this function.')
+        raise
 
     reglist = []
 

docs/index.rst

@@ -114,7 +114,7 @@ and for running the tests:
 * `pytest-rerunfailures <https://github.com/pytest-dev/pytest-rerunfailures>`__
 
 The following packages are optional dependencies and are required for the
-full functionality of the `~astroquery.mocserver` module:
+full functionality of the `~astroquery.mocserver`, `~astroquery.alma`, and `~astroquery.xmatch` modules:
 
 * `astropy-healpix <http://astropy-healpix.readthedocs.io/en/latest/>`_
 * `regions <https://astropy-regions.readthedocs.io/en/latest/>`_