Update README.md

Author: egil

README.md

@@ -27,7 +27,7 @@ Read more about the available options on the [Diffing Options/Strategies](/docs/
 # Documentation
 - [Diffing Options/Strategies](/docs/Strategies.md)
 - [Creating custom diffing options/strategies](/docs/CustomStrategies.md)
-- [Difference engine internals](/docs/DifferenceEngineInternals.md)
+- [Difference engine internals](/docs/DiffingEngineInternals.md)
 
 ## Acknowledgments
 Big thanks to [Florian Rappl](https://github.com/FlorianRappl) from the AngleSharp team for providing ideas, input and sample code for working with AngleSharp.