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autocolorscale doesn't seem to pickup on diverging numberlines

See original GitHub issue

I have a data set for employment in the US. When I use autocolorscale with a diverging set (i.e numbers that are negative and positive), many positive numbers get picked up as negative ones.

Below is a Choropleth figure that this can be tested on. Only a few numbers are negative, yet the colorscale makes many of the states appear negative. This could easily be fixed if a zero could be applied to the scale, rather than percentage of zmin/zmax.

Choropleth({
    'autocolorscale': True,
    'hoverinfo': 'location+text',
    'locationmode': 'USA-states',
    'locations': [AL, AK, AZ, AR, CA, CO, CT, DE, DC, FL, GA, HI, ID, IL, IN, IA,
                  KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM,
                  NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA,
                  WV, WI, WY, GU, PR, VI],
    'marker': {'line': {'color': '#ffffff', 'width': 1}},
    'text': [9,580, -5,330, 51,060, 8,810, 728,430, 47,620, -11,860, 1,930, 5,840,
             197,000, 89,120, 870, 22,140, 24,040, 27,230, 550, -5,070, 6,780,
             -20,110, 2,790, 23,430, 68,160, 63,950, 27,870, 2,190, 30,830, 6,000,
             2,230, 39,290, 4,900, 52,120, -4,360, 110,220, 67,370, -8,530, 32,750,
             -13,890, 39,850, 34,590, 720, 29,640, 1,950, 22,710, 145,630, 35,770,
             440, 29,360, 119,500, -8,910, 20,160, -8,140, 0, -7,580, 170],
    'z': [9580.0, -5330.0, 51060.0, 8810.0, 728430.0, 47620.0, -11860.0, 1930.0,
          5840.0, 197000.0, 89120.0, 870.0, 22140.0, 24040.0, 27230.0, 550.0,
          -5070.0, 6780.0, -20110.0, 2790.0, 23430.0, 68160.0, 63950.0, 27870.0,
          2190.0, 30830.0, 6000.0, 2230.0, 39290.0, 4900.0, 52120.0, -4360.0,
          110220.0, 67370.0, -8530.0, 32750.0, -13890.0, 39850.0, 34590.0, 720.0,
          29640.0, 1950.0, 22710.0, 145630.0, 35770.0, 440.0, 29360.0, 119500.0,
          -8910.0, 20160.0, -8140.0, 0.0, -7580.0, 170.0]
})