Deprecation notice about urllib3[secure] (#746)

* Removed urllib3[secure] dependencies

 Removed 'urllib3[secure] < 1.25 ; python_version < "3.5"' and  'urllib3[secure] < 2 ; python_version >= "3.5"'

* updated with urllib3 dependency

updated with urllib3 dependency but without the urllib3[secure] extra

* reverted back urllib3[secure] < 1.25.x or earlier

reverted back the urllib3[secure] extra for earlier versions of urllib3

Author: fyunusa

setup.py

@@ -66,7 +66,7 @@
         'importlib-metadata ; python_version < "3.8"',
         "psutil>=5,<6",
         'urllib3[secure] < 1.25 ; python_version < "3.5"',
-        'urllib3[secure] < 2 ; python_version >= "3.5"',
+        'urllib3 < 2 ; python_version >= "3.5"',
         "wrapt>=1.10,<2.0",
     ],
     keywords=["apm", "performance monitoring", "development"],