Update invalid get_order() due to Avanza API change

[swechencheng]

This commit aims to fix the old API/URL, which gives you 400 response.

[Unt3r]

It works-very good!
I have not been able to find it by using the inspect function in the browser.
Can you elighten me how you found it?

[swechencheng]

It works-very good! I have not been able to find it by using the inspect function in the browser. Can you elighten me how you found it?

Thanks!
Sure, in the browser, I monitor all network traffic, and randomly click around different buy/sell/edit buttons.

In the beginning, I used #142 to check SSE events such as push orders. However, it seems to be still immature and under development inside Avanza. Same to deals SSE and stoploss SSE.

Then I go back to normal requests. Luckily, this new get-order endpoint attracted my eyeballs when I clicked edit order.

[Qluxzz]

LGTM, thanks for contributing!