Support For New Empower Site

[Fretless14]

Since Personal Capital has moved to Empower, this needs updated since everything points to the old URL and logging in with the old URL creates a LoginException error.

Any plans on doing so?

Edit:
Looks like all the requests are the same. Wonder if simply changing the URL can just make it work. I might play around and come back (if I don't that means it didn't work or I haven't looked into it)

Edit 2:
Yes it does work! change the base_url to:
base_url = 'https://pc-api.empower-retirement.com'

[Fretless14]

Reopened since it should be fixed in the repo

[traviscook21]

I've opened a PR for this plus some additional fixes from fork I had been depending on. If @haochi isn't maintaining, we could just work off a new fork

#29

[wpwilson10]

Here's an alternative that currently works: personalcapital2