Add support to python 3.13.

Author: Davi0kProgramsThings

setup.py

@@ -23,6 +23,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
     ],
     keywords="bitfinex,api,trading",
     project_urls={