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

Patch by IƱigo Serna.
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index 0498ca8..051d165 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -91,6 +91,14 @@
 
 (:issue:`12100`)
 
+curses
+------
+
+The :class:`curses.window` class has a new :class:`~curses.window.get_wch`
+method to a wide character. Patch by Iñigo Serna.
+
+(:issue:`6755`)
+
 faulthandler
 ------------