Move changelog entry for #2179
For background on how this happened see
https://forum.restic.net/t/psa-attention-anyone-not-using-a-recent-master-ie-0-9-5-version-restic-will-not-detect-changed-files-if-mtime-is-reset-by-the-application-eg-ms-excel-and-xls-xlsx-files-on-macos/1772/8?u=fd0
