feat: add -X/--dereference completions

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

completions/fish/exa.fish

@@ -69,6 +69,7 @@ complete -c exa -s 't' -l 'time'     -d "Which timestamp field to list" -x -a "
     accessed\t'Display accessed time'
     created\t'Display created time'
 "
+complete -c exa -s 'X' -l 'dereference'   -d "dereference symlinks for file information"
 complete -c exa -s 'm' -l 'modified'      -d "Use the modified timestamp field"
 complete -c exa -s 'n' -l 'numeric'       -d "List numeric user and group IDs."
 complete -c exa        -l 'changed'       -d "Use the changed timestamp field"