bpo-30928: Update idlelib/NEWS.txt. (#6995)

Author: terryjreedy

Lib/idlelib/NEWS.txt

@@ -3,6 +3,11 @@ Released on 2018-06-18?
 ======================================
 
 
+bpo-32831: Add docstrings and tests for codecontext.py.
+Coverage is 100%.  Patch by Cheryl Sabella.
+
+bpo-33564: Code context now recognizes async as a block opener.
+
 bpo-21474: Update word/identifier definition from ascii to unicode.
 In text and entry boxes, this affects selection by double-click,
 movement left/right by control-left/right, and deletion left/right