Fix changelog about version 0.43.0

[alamb]

In my haste I seem to have released a version 0.43.0 without any changes. Thus let's make this clear in the readme and update CHANGELOG to avoid confusion

[alamb]

I plan to release 0.43.1 simply to get the right readme

[coveralls]

Pull Request Test Coverage Report for Build 7660500839

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A quick fix for this PR: rebase it; your next report should be accurate.

• 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 87.658%

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Totals
Change from base Build 7660253283:	0.0%
Covered Lines:	19482
Relevant Lines:	22225

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💛 - Coveralls