Floating point support for gauges?

[billygout]

I note that our Gauge() function takes an int64 value, and thus cannot represent floating-point values, and I have an application which uses floating point values to represent a fraction between 0 and 1. I also note that at least one other library takes a float64 for the gauges value (see: https://github.com/DataDog/datadog-go/blob/v5.0.2/statsd/statsd.go#L504). So, I'm curious if you would consider the addition of a new function with the following signature, or the like:
func (s *Client) FloatGauge(stat string, value float32, rate float32, tags ...Tag) error

If so, I might be able to PR it.

[billygout]

Oops, i just realized you have a closed issue for this already: #36

I will comment there instead.

[dropwhile]

reopening ticket for tracking.

[dropwhile]

@billygout
I added support for this to master:HEAD. Let me know if this is fit for your needs.
I'll likely tag a release in the new year if I don't hear of any breakages/issues.

Note: I added the new Floaty methods to a new interface, so as not to break existing usages... as well as to highlight that some servers may not support this extended feature-set.

Happy Holidays!