Close #6755: Add get_wch() method to curses.window class

Patch by IƱigo Serna.
diff --git a/Doc/library/curses.rst b/Doc/library/curses.rst
index 16b7681..3450494 100644
--- a/Doc/library/curses.rst
+++ b/Doc/library/curses.rst
@@ -846,6 +846,14 @@
    until a key is pressed.
 
 
+.. method:: window.get_wch([y, x])
+
+   Get a wide character. Like :meth:`getch`, but the integer returned is the
+   Unicode code point for the key pressed, so it can be passed to :func:`chr`.
+
+   .. versionadded:: 3.3
+
+
 .. method:: window.getkey([y, x])
 
    Get a character, returning a string instead of an integer, as :meth:`getch`