Remove obsolete README.rst (#41)
The README.rst file was left in place, since the current version of
typing-extensions on PyPI still links to it. Since typing_extensions now
moved as a whole, we don't that link in the current directory. The
typing repository still has a link.
Cf. #13
diff --git a/README.rst b/README.rst
deleted file mode 100644
index 608eaca..0000000
--- a/README.rst
+++ /dev/null
@@ -1 +0,0 @@
-Please see `README.md <https://github.com/python/typing_extensions/blob/main/README.md>`_ for the current version of the README file.
