Skip coverage in type checking statement

Author: abravalheri

importlib_metadata/_py39compat.py

@@ -3,7 +3,8 @@
 """
 from typing import TYPE_CHECKING, Any, Optional, Tuple
 
-if TYPE_CHECKING:  # -> prevent circular imports on runtime.
+if TYPE_CHECKING:  # pragma: no cover
+    # Prevent circular imports on runtime.
     from . import Distribution, EntryPoint
 else:
     Distribution = EntryPoint = Any