Dispatch for exponentiation on Float32 intervals

[mfherbst]

Currently this fails:

Interval(1.0f0) ^ Interval(1.0f0)

while this works

Interval(1.0) ^ Interval(1.0)

With this change both things will work, but I'm not too sure if it's the right thing to do.

Happy to add tests etc.

[codecov-commenter]

Codecov Report

Merging #482 (887e438) into master (a3dc27f) will decrease coverage by 1.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #482      +/-   ##
==========================================
- Coverage   91.55%   90.35%   -1.20%     
==========================================
  Files          25       25              
  Lines        1752     1794      +42     
==========================================
+ Hits         1604     1621      +17     
- Misses        148      173      +25     

Impacted Files	Coverage Δ
src/intervals/functions.jl	96.08% <100.00%> (+4.66%)	⬆️
src/intervals/rounding_macros.jl	0.00% <0.00%> (-100.00%)	⬇️
src/decorations/functions.jl	83.81% <0.00%> (-11.51%)	⬇️
src/decorations/intervals.jl	74.46% <0.00%> (-10.32%)	⬇️
src/intervals/macros.jl	100.00% <0.00%> (ø)
src/multidim/setdiff.jl	100.00% <0.00%> (ø)
src/intervals/hyperbolic.jl	100.00% <0.00%> (ø)
src/plot_recipes/plot_recipes.jl	0.00% <0.00%> (ø)
src/intervals/trigonometric.jl	97.68% <0.00%> (+0.01%)	⬆️
src/intervals/precision.jl	96.77% <0.00%> (+0.10%)	⬆️
... and 8 more

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[lbenet]

Thanks @mfherbst and sorry for the long delay to get into this. It would be nice to have some tests. Aside from that, LGTM!

[lbenet]

Incidentally, I noticed that this works in the 1.0-branch