[3.7] bpo-34162: Update idlelib/NEWS.txt to 2018-12-20 (GH-11255)#11256

Merged

terryjreedy merged 1 commit intopython:3.7from

terryjreedy:news37

Dec 20, 2018

Commits on Dec 20, 2018

[3.7] bpo-34162: Update idlelib/NEWS.txt to 2018-12-20 (GH-11255)
terryjreedy
committed