Add Changelog for 1.18.3 and correct date of 1.18.3 release#1338

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JamesWTruher merged 1 commit intoPowerShell:masterfrom

bergmeister:changelog_1.18.3

Sep 12, 2019

Commits on Sep 12, 2019

Add Changelog for 1.18.3 and correct date of 1.18.2 release
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