feat: Add more info to user-agent string

Author: JanEbbing

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
   Note: older library versions also support the new languages, this update only adds new code constants.
 ### Changed
+* Added system, python and request library version information to the user-agent string that is sent with API calls.
 ### Deprecated
 ### Removed
 ### Fixed

deepl/http_client.py

@@ -5,14 +5,18 @@
 from . import version
 from .exceptions import ConnectionException, DeepLException
 import http
+import platform
 import random
 import requests
 import time
 from typing import Dict, Optional, Tuple, Union
 from .util import log_info
 
 
-user_agent = f"deepl-python/{version.VERSION}"
+user_agent = (
+    f"deepl-python/{version.VERSION} ({platform.platform()}) "
+    f"python/{platform.python_version()} requests/{requests.__version__}"
+)
 max_network_retries = 5
 min_connection_timeout = 10.0