Fix broken links in Changelog

Author: sidrao2006

flutter_cache_manager/CHANGELOG.md

@@ -2,10 +2,8 @@
 * Disabled resizing of cached gifs as this was broken.
 
 ## [3.1.2] - 2021-06-17
-* removeFile function now completes after the file is removed from disk and not earlier ([#323](https://github.
-  com/Baseflow/flutter_cache_manager/pull/323))
-* Image resizing doesn't block ui anymore and doesn't use image package but existing Flutter components ([#319](https://github.
-  com/Baseflow/flutter_cache_manager/pull/319))
+* removeFile function now completes after the file is removed from disk and not earlier ([#323](https://github.com/Baseflow/flutter_cache_manager/pull/323))
+* Image resizing doesn't block ui anymore and doesn't use image package but existing Flutter components ([#319](https://github.com/Baseflow/flutter_cache_manager/pull/319))
 
 ## [3.1.1] - 2021-06-03
 * Move File to separate file. You can add it using the following import: