Correct signature of inference

Author: emmatyping

mypy/main.py

@@ -248,7 +248,7 @@ def _python_executable_from_version(python_version: Tuple[int, int]) -> str:
 
 def infer_python_version_and_executable(options: Options,
                                         special_opts: argparse.Namespace
-                                        ) -> Options:
+                                        ):
     # Infer Python version and/or executable if one is not given
     if special_opts.python_executable is not None and special_opts.python_version is not None:
         py_exe_ver = _python_version_from_executable(special_opts.python_executable)