Web export is broken for now. Need to move to mobile API.

[egregors]

ZenMoney developers abandoned web-version of service. So, web API to download backups is not work anymore.
In this case, I believe I should try to move this util to mobile API.

• find the way how to login by mobile API
• find the way to download backups
• update tests
• update README
• release new major version

ref: https://github.com/zenmoney/ZenPlugins/wiki/ZenMoney-API

[spatecon]

Why don't you use official OAuth with refresh token?
It seems like if you save new refresh token after each job done it can be used indefinitely long.

[egregors]

To be honest, I don't remember why. Probably, OAuth API wasn't ready yet. But now, it looks like we can completely rework the whole app. If you have an idea how exactly we may do that, feel free to share it.