fix: change version retrieval

Author: Midnighter

setup.cfg

@@ -36,6 +36,7 @@ zip_safe = True
 install_requires =
     depinfo
     httpx
+    importlib_metadata; python_version <'3.8'
     ordered-set
     pydantic
     python-dotenv

src/structurizr/api/structurizr_client_settings.py

@@ -21,9 +21,13 @@
 from pathlib import Path
 from socket import getfqdn
 
-from pydantic import UUID4, BaseSettings, DirectoryPath, Field, HttpUrl
 
-from .. import __version__
+try:
+    from importlib.metadata import version
+except ModuleNotFoundError:
+    from importlib_metadata import version
+
+from pydantic import UUID4, BaseSettings, DirectoryPath, Field, HttpUrl
 
 
 __all__ = ("StructurizrClientSettings",)
@@ -44,7 +48,7 @@
 if hostname:
     USER = f"{USER}@{hostname}"
 
-AGENT = f"structurizr-python/{__version__}"
+AGENT = f"structurizr-python/{version('structurizr-python')}"
 
 
 class StructurizrClientSettings(BaseSettings):