* Update Powerline for ipython >=7
The method used for `since_5` does not work, but `since_7` does, however it is not documented.
I personally haven't found `c = get_config()` to be useful once you have generated the default `~/.ipython/profile_default/ipython_config.py` file.
Since `c.TerminalInteractiveShell.simple_prompt` is set to `False` by default, it's not worth mentioning it. There's many other things that **can** break if you change the default config options too. Additionally, `simple_prompt=True` doesn't fatally break anything, just make things less pretty. So it'd be better to not have that, but mention if things don't look pretty to make sure they didn't change that default.
* Making it work on latest version
* spacing
4b24e715dc