using both cheapest and exportrates as true causes styling to be lost

[syserr0r]

Removing the cheapest: true line fixes the styling.

With the broken styling (cheapest: true) the source looks like this:

<tr class="rate_row">
    <td class="time  time_undefined">07:30 pm</td>
    <td class="rate undefined">23.24p/kWh</td>
</tr>

Without broken styling the source looks like this:

<tr class="rate_row">
    <td class="time  time_green">21:00</td>
    <td class="rate green">23.24p</td>
</tr>

Note that I used the examples from the README in this case
It may also be worth noting I am not currently on agile (so all prices reported are the same) however I wouldn't expect this to break things.