Define broadcastable for scalars

[omus]

Note: AbstractDateTime already had this defined.

Fixes: #175

[codecov-io]

Codecov Report

Merging #177 into master will decrease coverage by 0.08%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
- Coverage   92.05%   91.96%   -0.09%     
==========================================
  Files          30       30              
  Lines        1057     1058       +1     
==========================================
  Hits          973      973              
- Misses         84       85       +1

Impacted Files	Coverage Δ
src/types/timezone.jl	95% <0%> (-5%)	⬇️

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[iamed2]

The thing about these tests is that they'd still pass if broadcasting was enabled if you defined iteration for time zones.

[omus]

The thing about these tests is that they'd still pass if broadcasting was enabled if you defined iteration for time zones.

Would an explicit broadcastable test in addition to the current test be better?

[iamed2]

I think you should just broadcast with something else and test the result