CHANGELOG.md: Add entry for PR #90

Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>

Author: chenxiaolong

CHANGELOG.md

@@ -18,6 +18,7 @@
 * Prevent Syncthing from running when the local storage permission is denied ([PR #88])
   * This prevents data loss because when the permission is denied, Android only hides files, not folders. `.stfolder` remains visible, so Syncthing would think all files were deleted.
 * Fix folder picker button incorrectly being clickable when editing existing shared folder ([PR #89])
+* Backport upstream golang fix to resolve crash on 32-bit ARM devices running Android <11 ([PR #90])
 
 ### Version 1.20
 
@@ -221,3 +222,4 @@
 [PR #87]: https://github.com/chenxiaolong/BasicSync/pull/87
 [PR #88]: https://github.com/chenxiaolong/BasicSync/pull/88
 [PR #89]: https://github.com/chenxiaolong/BasicSync/pull/89
+[PR #90]: https://github.com/chenxiaolong/BasicSync/pull/90