Fix indentation warning in requires function.

Author: jaraco

importlib_metadata/__init__.py

@@ -881,7 +881,7 @@ def requires(distribution_name):
     Return a list of requirements for the named package.
 
     :return: An iterator of requirements, suitable for
-    packaging.requirement.Requirement.
+        packaging.requirement.Requirement.
     """
     return distribution(distribution_name).requires