bpo-34162: Last idlelib/NEWS.txt items for 3.8.0. (GH-16943)

bpo-34162: Last idlelib/NEWS.txt items for 3.8.0. (GH-16943) · python/cpython@bc30db1

Original file line number	Diff line number	Diff line change
`@@ -2,6 +2,15 @@ What's New in IDLE 3.7.5`
`2`	`2`	`Released on 2019-09-30?`
`3`	`3`	`======================================`
`4`	`4`
	`5`	`+bpo-36698: IDLE no longer fails when writing non-encodable characters`
	`6`	`+to stderr. It now escapes them with a backslash, like the regular`
	`7`	`+Python interpreter. Add an errors field to the standard streams.`
	`8`	`+`
	`9`	`+bpo-13153: Improve tkinter's handing of non-BMP (astral) unicode`
	`10`	`+characters, such as 'rocket \U0001f680'. Whether a proper glyph or`
	`11`	`+replacement char is displayed depends on the OS and font. For IDLE,`
	`12`	`+astral chars in code interfere with editing.`
	`13`	`+`
`5`	`14`	`bpo-35379: When exiting IDLE, catch any AttributeError. One happens`
`6`	`15`	`when EditorWindow.close is called twice. Printing a traceback, when`
`7`	`16`	`IDLE is run from a terminal, is useless and annoying.`