DEP: drop undeclared runtime dependency on setuptools

mpl_scatter_density/__init__.py

@@ -1,9 +1,11 @@
 from .scatter_density_artist import *  # noqa
 from .scatter_density_axes import *  # noqa
 
-from pkg_resources import get_distribution, DistributionNotFound
+import sys
+if sys.version_info >= (3, 8):
+    from importlib.metadata import version
+else:
+    from importlib_metadata import version
 
-try:
-    __version__ = get_distribution('mpl-scatter-density').version
-except DistributionNotFound:
-    __version__ = 'undefined'
+__version__ = version("mpl-scatter-density")
+del version, sys

setup.cfg

@@ -17,6 +17,7 @@ install_requires =
     numpy
     matplotlib>=3.0
     fast-histogram>=0.3
+    importlib_metadata>=1.4 ; python_version < '3.8'
 
 [options.extras_require]
 test =