Add instance Bounded (Ratio a)

[Eric Mertens]

Ratio only only generally be used with Integer, which isn’t itself an instance of Bounded. This probably wouldn’t be a very useful instance. It has overflow issues with Bounded types like Int for various operations including comparisons.

> On Jun 16, 2019, at 10:14 AM, Vanessa McHale <vanessa.mchale at iohk.io> wrote:
> 
> Signed PGP part
> Seems sensible. Out of curiosity, what would this help with?
> 
> On 6/14/19 6:44 PM, Dannyu NDos wrote:
>> instance (Integral a, Bounded a) => Bounded (Ratio a) where
>>     minBound = minBound % 1
>>     maxBound = maxBound % 1
>> 
>> 
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