Update index.md

Author: karussell

docs/index.md

@@ -41,7 +41,7 @@ The elevation configuration is separately documented [here](./core/elevation.md)
 
 [The quickstart](./core/quickstart-from-source.md) is an introduction for developers. Explains git checkout, IDE setup and commands for setting up a GraphHopper server.
 
-Find all changes in previous and current versions in the [changelogs](../core/files/changelogs.txt).
+Find all changes in previous and current versions in the [changelogs](../core/files/changelog.txt).
 
 #### Contribute