Update index.html

Author: basicx-StrgV

docs/index.html

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 <p>Version 4.0 is intended as a “health” update for the library and therefore includes changes to the structure, classes and functions. <br  />
  This includes breaking changes to the usage of the library.</p>
 <p><em><b>But fear not, no functionality is lost and all breaking changes are documented and provide information on how to change the implementation.</b></em></p>
-<p>You can find the full migration documentation <a href="https://github.com/basicx-StrgV/WGet.NET/blob/develop/migration_info/V3-V4.md">here</a>.</p>
+<p>You can find the full migration documentation <a href="https://github.com/basicx-StrgV/WGet.NET/blob/main/migration_info/V3-V4.md">here</a>.</p>
 <p>This was done to improve maintainability and the experience of using the library, by improving the data structure, removing redundant or useless functions and making the implementation more consistent.</p>
 <p><em><b>More information about version 4.0 can be found <a href="https://github.com/basicx-StrgV/WGet.NET/releases/tag/4.0.0">here</a>.</b></em></p>
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