Fix badge links (#2193)

README.md

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 <a href="https://www.fluentassertions.com"><img src="docs/assets/images/fluent_assertions_large_horizontal.svg" style="width:400px"/></a>
 
 # Extension methods to fluently assert the outcome of .NET tests
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 A very extensive set of extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style unit tests. Targets .NET Framework 4.7, as well as .NET Core 2.1, .NET Core 3.0, .NET 6, .NET Standard 2.0 and 2.1.