Changelog for 4.0.0

Note that this needs an update to reference the published version of v4.0.0, once that is available.

Pull Request Test Coverage Report for Build #309

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.38%

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Totals
Change from base Build #304:	0.0%
Covered Lines:	481
Relevant Lines:	484

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💛 - Coveralls