Scraping for ERC20 tokens

The idea was to scrape the list of ERC20 tokens from a webpage (https://eidoo.io/erc20-tokens-list/). BUT I was running in CORS issues, so now a copy of the page sits in the root folder.
Some options are:
* Find a proper API for the list
* Fix the CORS issue
* Maintain a list in the `customcatagories.json` file
* Keep the local copy of the page up to date. 