Merge pull request python#237 from FFY00/avoid-abreviations-in-transversable-docs

abc: avoid abbreviations in the Traversable documentation

Author: jaraco

importlib_resources/abc.py

@@ -76,7 +76,7 @@ def read_text(self, encoding=None):
     @abc.abstractmethod
     def is_dir(self) -> bool:
         """
-        Return True if self is a dir
+        Return True if self is a directory
         """
 
     @abc.abstractmethod