Update amazon_product_review_scraper.py

[ankitagr01]

the proxy generator function is not working as in the HTML they have removed the id tag of the tables, and when we try soup.find(id='proxylisttable') it returns None, so we need to parse as per the table class: soup.find(class_='table table-striped table-bordered'). Doing this returns all the proxy and the code works perfectly there after.