fix: add immutabledict to setup

setup.py

@@ -5,7 +5,7 @@ with open("README.md") as readme_file:
 
 setup_args = dict(
     name="py-gitea",
-    version="0.2.7",
+    version="0.2.8",
     description="A python wrapper for the Gitea API",
     long_description_content_type="text/markdown",
     long_description=README,
@@ -20,7 +20,7 @@ setup_args = dict(
 
 install_requires = [
     "requests",
-    "frozendict",
+    "immutabledict",
 ]
 
 extras_require = {"test": ["pytest"]}