Tidied up dependencies

glue_vispy_viewers/__init__.py

@@ -1,9 +1,6 @@
-from pkg_resources import get_distribution, DistributionNotFound
+import importlib.metadata
 
-try:
-    __version__ = get_distribution(__name__).version
-except DistributionNotFound:
-    __version__ = 'undefined'
+__version__ = importlib.metadata.version('glue-vispy-viewers')
 
 try:
     import OpenGL  # noqa

setup.cfg

@@ -15,12 +15,12 @@ install_requires =
     pyopengl
     glue-core>=1.0
     glue-qt>=0.1
+    echo>=0.6
     qtpy
     scipy
-    astropy>=4.0
-    pillow
     matplotlib
     vispy>=0.9.1
+    importlib_metadata>=3.6; python_version<'3.10'
 python_requires = >=3.8
 
 [options.entry_points]
@@ -39,6 +39,8 @@ test =
     mock
 qt =
     PyQt5>=5.9
+all =
+    imageio
 
 [options.package_data]
 glue_vispy_viewers.common = *.ui, *.png