Android os version usage by percentage

Example output

> hubot android usage

Donut [4] .................... 0.1%
Eclair [7] ................... 1.2%
Froyo [8] .................... 2.5%
Gingerbread [9] .............. 0.1%
Gingerbread [10] ............. 33.0%
Honeycomb [13] ............... 0.1%
Ice Cream Sandwich [15] ...... 22.5%
Jelly Bean [16] .............. 34.0%
Jelly Bean [17] .............. 6.5%