Use os.path.relpath in Version.get_conf_py_path

Author: gregmuellegger

readthedocs/builds/models.py

@@ -185,10 +185,8 @@ def get_downloads(self, pretty=False):
 
     def get_conf_py_path(self):
         conf_py_path = self.project.conf_dir(self.slug)
-        if not conf_py_path.endswith('/'):
-            conf_py_path += '/'
         checkout_prefix = self.project.checkout_path(self.slug)
-        conf_py_path = conf_py_path[len(checkout_prefix):]
+        conf_py_path = os.path.relpath(conf_py_path, checkout_prefix)
         return conf_py_path
 
     def get_build_path(self):