SpecialFunctions.logabsgamma return type changed

[jmkuhn]

In SpecialFunctions v0.8 - v1.5 the return type of logabsgamma was (Floatxx, Int32). Starting with v1.6 it is (Floatxx, Int). Should we change the return type here and set the lower version limit on SpecialFunctions to v1.6?

[stevengj]

We might as well change the return type to Int, but I don't see why we would need to change the version limit?

(Technically, nothing requires us to use the same integer type as logabsgamma(::Float64) AFAICT.)

[jmkuhn]

You are correct; our input and return floating point types are different, so there is no reason our return integer type has to be the same. The PR changes the return integer type but keeps the SpecialFunction version limits the same.