Humanize Format Relative Error For Multiple Granularities

[anishnya]

Issue Description

System Info

• 🖥 OS name and version:
• 🐍 Python version:
• 🏹 Arrow version:

    import arrow
    arw = arrow.Arrow(2013, 1, 1, 0, 0, 0)
    later = arw.shift(seconds=3600)
    humanize_string = arw.humanize(later, granularity=["second", "hour", "day", "month", "year"],)
    print(humanize_string)
    >>> "in 0 years 0 months 0 days an hour and 0 seconds"

"in 0 years 0 months 0 days an hour and 0 seconds" should be "0 years 0 months 0 days an hour and 0 seconds ago". I suspect this is dude to the fact in describe-mutli we take timeframes[-1], which in this case would be 0. This results in format relative defaulting to it's positive version. We might need a linear search through all the timeframe units to better determine the correct relative phrase to use.