Prepare for upcoming Zonky changes

[triceo]

Zonky will soon roll out the following changes:

• Max loan term goes up to 10 years.
• Max loan amount goes up to 900k.

I am making the necessary changes. I was not able to find any references to the original 700k amount, but I believe I changed all the term stuff.

Nice clean code, was easy to modify! Please point out if I skipped anything.

[jhrcek]

@triceo Let me know when you want this deployed and I'll create a PR to robozonky.github.io

[triceo]

@jhrcek Please create the PR and I'll merge it when I need to. I expect to be releasing 6.3.3 later today.

[jhrcek]

Done. And regarding

I was not able to find any references to the original 700k amount

The tool doesn't enforce any max limit there. Should it or is it ok as is?

[triceo]

I think it would be reasonable to have some limit there. Since there is no way how the amount would ever exceed 900k, let's set that as the limit.

That said, I will not be adding a limit to the strategy itself.

[jhrcek]

Of course, I'll add it later