Fixes in setup.py.

setup.py

 from setuptools import setup, find_packages
-from os import path
+import os
 
 tests_require = ["pytest"]
 
@@ -13,7 +13,7 @@ docs_require = [
 ]
 
 setup(
-    use_scm_version={"write_to": os.path.join("magicctapipe", "_version.py")},
+    use_scm_version={"write_to": os.path.join("ctapipe_io_magic", "_version.py")},
     packages=find_packages(),
     install_requires=[
         'ctapipe~=0.12.0',