modify dcu_version

setup.py

@@ -162,7 +162,7 @@ def get_version_add(sha: Optional[str] = None) -> str:
 
 def get_version():
     get_version_add()
-    version_file = 'version.py'
+    version_file = 'fastfold/version.py'
     with open(version_file, encoding='utf-8') as f:
         exec(compile(f.read(), version_file, 'exec'))
     return locals()['__dcu_version__']