Update packer.py
Update packer.py

fixed elements 37...61 usage
bitwiseman/js-beautify,beautify-web/js-beautify,beautify-web/js-beautify,bitwiseman/js-beautify,beautify-web/js-beautify,beautify-web/js-beautify,bitwiseman/js-beautify,bitwiseman/js-beautify