Fix range(::HalfInteger; stop, length)

[sostock]

Before:

julia> range(HalfInt(1/2), stop=HalfInt(3), length=5)
5-element LinRange{Half{Int64}}:
Error showing value of type LinRange{Half{Int64}}:
ERROR: InexactError: Int64(2.25)
Stacktrace:
[...]

After:

julia> range(HalfInt(1/2), stop=HalfInt(3), length=5)
0.5:0.625:3.0

[codecov-io]

Codecov Report

Merging #28 (6dea19c) into master (47ebe89) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #28   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          205       208    +3     
=========================================
+ Hits           205       208    +3     

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

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