[3.7] bpo-30928: IDLE - update NEWS.txt. (GH-5539)#5540

Merged

terryjreedy merged 1 commit intopython:3.7from

miss-islington:backport-05e8067-3.7

Feb 5, 2018

Commits on Feb 5, 2018

Add entry for uniform lower context; add 'since' to be explicit. (GH-5539)

terryjreedy
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miss-islington
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