start and end block arguments missing from ERC20 paginated results

[le-hungry-ghost]

The paginated options for the ERC20 search are less complete than the API. The start and end block arguments are missing and there is no ability to do a paginated search of ERC20 transactions by address.

[github-actions]

Thanks for reporting this issue, we are on it :)

[le-hungry-ghost]

Pull request here (but if the two functions could be consolidated with an optional argument for contract address), it would be better.
#42