Replace deprecated pkg_resources (#45)

* replace deprecated pkg_resources package

* Update supported python versions

Author: rafa-guedes

setup.py

@@ -23,6 +23,9 @@
     'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
+    'Programming Language :: Python :: 3.10',
+    'Programming Language :: Python :: 3.11',
+    'Programming Language :: Python :: 3.12',
     'Topic :: Scientific/Engineering',
 ]
 

src/xoak/__init__.py

@@ -1,10 +1,14 @@
-from pkg_resources import DistributionNotFound, get_distribution
+try:
+    from importlib.metadata import version, PackageNotFoundError
+except ImportError:
+    # Python < 3.8
+    from importlib_metadata import version, PackageNotFoundError
 
 from .accessor import XoakAccessor
 from .index import IndexAdapter, IndexRegistry
 
 try:
-    __version__ = get_distribution(__name__).version
-except DistributionNotFound:  # pragma: no cover
+    __version__ = version(__name__)
+except PackageNotFoundError:  # pragma: no cover
     # package is not installed
     pass