Fix link to changelog

README.md

@@ -102,7 +102,7 @@ AdminLTE 1.x can be easily upgraded to 2.x using [this guide](https://almsaeedst
 
 Change log
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-**For the most recent change log, visit the [releases page](https://github.com/almasaeed2010/AdminLTE/releases) or the [changelog file](https://github.com/almasaeed2010/AdminLTE/blob/master/changelog).** We will add a detailed release notes to each new release. 
+**For the most recent change log, visit the [releases page](https://github.com/almasaeed2010/AdminLTE/releases) or the [changelog file](https://github.com/almasaeed2010/AdminLTE/blob/master/changelog.md).** We will add a detailed release notes to each new release. 
 
 Image Credits
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