Require Astropy 2.0 or later

doc/installation/dependencies.rst

@@ -9,7 +9,7 @@ Glue has the following required dependencies:
 * `Numpy <http://www.numpy.org>`_ 1.9 or later
 * `Matplotlib <https://matplotlib.org/>`_ 2.0 or later
 * `Pandas <http://pandas.pydata.org/>`_ 0.14 or later
-* `Astropy <http://www.astropy.org>`_ 1.0 or higher
+* `Astropy <http://www.astropy.org>`_ 2.0 or higher
 * `setuptools <http://setuptools.readthedocs.io/en/latest/>`_ 1.0 or later
 * Either `PyQt5 <https://www.riverbankcomputing.com/software/pyqt/intro>`__ or
   `PySide2 <https://wiki.qt.io/PySide2>`__

glue/_deps.py

@@ -162,7 +162,7 @@ def installed(self):
     Dependency('bottleneck', 'Required', min_version='1.2'),
     Dependency('matplotlib', 'Required for plotting', min_version='2.0'),
     Dependency('pandas', 'Adds support for Excel files and DataFrames', min_version='0.14'),
-    Dependency('astropy', 'Used for FITS I/O, table reading, and WCS Parsing', min_version='1.3'),
+    Dependency('astropy', 'Used for FITS I/O, table reading, and WCS Parsing', min_version='2.0'),
     Dependency('dill', 'Used when saving Glue sessions', min_version='0.2'),
     Dependency('h5py', 'Used to support HDF5 files', min_version='2.4'),
     Dependency('xlrd', 'Used to support Excel files', min_version='1.0'),

setup.py

@@ -76,7 +76,7 @@
 
 install_requires = ['numpy>=1.9',
                     'pandas>=0.14',
-                    'astropy>=1.3',
+                    'astropy>=2.0',
                     'matplotlib>=2.0',
                     'qtpy>=1.2',
                     'setuptools>=1.0',