Resolve SC2162: 'read without -r mangles backslashes'

More information:

https://github.com/koalaman/shellcheck/wiki/SC2162

http://wiki.bash-hackers.org/commands/builtin/read

plugins/backup/commands

@@ -72,7 +72,7 @@ case "$1" in
     fi
 
     # create all the app directories
-    while read app; do mkdir "$TARGET_DIR/$app"; echo "Imported $app"; done < $BACKUP_TMP_DIR/.dokku_backup_apps
+    while read -r app; do mkdir "$TARGET_DIR/$app"; echo "Imported $app"; done < $BACKUP_TMP_DIR/.dokku_backup_apps
 
     # have the plugins import their stuff
     plugn trigger backup-import $VERSION "$BACKUP_ROOT" $TARGET_DIR "$BACKUP_TMP_DIR/.dokku_backup_apps"