fix(setup): README decoding issue (#452)

Author: fumiama

setup.py

@@ -5,7 +5,7 @@
     name="chattts",
     version=os.environ.get("CHTTS_VER", "develop"),
     description="A generative speech model for daily dialogue",
-    long_description=open("README.md").read(),
+    long_description=open("README.md", encoding="utf8").read(),
     long_description_content_type="text/markdown",
     author="2noise",
     author_email="[email protected]",