0.5.2

• Use windows size changed hook instead of configuration hook. (f34db57)
• Remove delay to avoid window-scroll-functions being called repeatedly (9728edf)
• Avoid Scan error: "Unbalanced parentheses" when custom save file (121f553)
• Refactor to increase performace, for #5 (7561700)
• Render thumbnail by window (#15)
• Never advice-remove to save-buffer (#17)
• Redesign indicators clean up logic (#21)