Add iszero(::Infinite)

[omus]

Allows iszero to be called on ∞. Useful for generic programming

julia> iszero(∞)
ERROR: InexactError: convert(Infinite, 0)
Stacktrace:
 [1] convert(::Type{Infinite}, ::Int64) at /Users/omus/.julia/dev/Infinity/src/infinite/conversion.jl:9
 [2] oftype(::Infinite, ::Int64) at ./essentials.jl:366
 [3] zero(::Infinite) at ./number.jl:265
 [4] iszero(::Infinite) at ./number.jl:40
 [5] top-level scope at REPL[4]:1

[codecov]

Codecov Report

Merging #21 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #21   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          175       176    +1     
=========================================
+ Hits           175       176    +1     

Impacted Files	Coverage Δ
src/infinite/comparison.jl	100.00% <100.00%> (ø)

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[cjdoris]

Thanks!