Merge branch 'master' into dev

Author: egil

README.md

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-![AngleSharp Diffing](/docs/header.png)
+<p align="center">
+  <img width="400" src="/docs/header.png">
+</p>
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 # AngleSharp Diffing - A diff/compare library for AngleSharp
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 AngleSharp Diffing makes it possible to compare AngleSharp _control_ nodes and _test_ nodes and get a list of differences between them.