fix: 🐛 generate loader.so

`from setuptools import setup` must be before Extension

pyencrypt/setup.py

@@ -1,8 +1,8 @@
 import os
 from pathlib import Path
 
-from Cython.Build import cythonize
 from setuptools import setup
+from Cython.Build import cythonize
 
 path = Path(os.getcwd()) / 'encrypted' / 'loader.py'
 setup(ext_modules=cythonize(path.as_posix()), )