Python 3.6.9: time.time_ns() not available

[stroblme]

'time.time_ns()' method is new in Python version 3.7 .
Therefore, testing in Python 3.6 resulted in an error message, stating that the module 'time' has no attribute 'time_ns()'.
As your Timer module only displays ms, I changed the code, so that it can be used in Python 3.6.

This issues occurred in a Colab VM and the fix has been successfully tested there.

Additionally, I added the vscode directory to the gitignore for obvious dev. purposes.

[nardew]

Hi @stroblme, thank you for the contribution but unfortunately bitpanda-aio is no longer actively maintained as advised at the beginning of the repo's front page. bitpanda-aio was replaced by cryptoxlib-aio where is my primary focus now. It should provide the same functionality and on top many more features.

I can merge your PR but I will first need to find some time to give it at the least a minimum testing (despite the fix is straightforward). Besides that, no new pypi packages will be generated.

[stroblme]

Hi @nardew , sorry for the late response. In my case I started the project where I used bitpanda-aio some time ago, when I wasn't aware of cryptoxlib-aio. Maybe I should change that by now.. Anyway, I get your point and as I don't see this PR as really urgent, feel free to reject :)