Get __version__ attribute from importlib metadata

Author: medihack

src/dicomweb_client/__init__.py

@@ -1,9 +1,14 @@
-__version__ = '0.59.3'
+import importlib.metadata
 
 from dicomweb_client.api import DICOMwebClient, DICOMfileClient
 from dicomweb_client.protocol import DICOMClient
 from dicomweb_client.uri import URI, URISuffix, URIType
 
+try:
+    __version__ = importlib.metadata.version(__name__)
+except importlib.metadata.PackageNotFoundError:
+    __version__ = '0.0.0'
+
 __all__ = [
     'DICOMClient',
     'DICOMfileClient',