Use ConstructionBase.setproperties instead of hand-coding setconfig

[tkf]

I suggest using ConstructionBase.setproperties instead of the manually coded setconfig.

[codecov-io]

Codecov Report

Merging #35 into master will decrease coverage by 0.18%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   80.76%   80.58%   -0.19%     
==========================================
  Files           2        2              
  Lines         104      103       -1     
==========================================
- Hits           84       83       -1     
  Misses         20       20

Impacted Files	Coverage Δ
src/ElectronDisplay.jl	77.01% <100%> (-0.27%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update de9d797...cbe022d. Read the comment docs.

[davidanthoff]

I like this, but maybe we can wait until ConstructionBase.jl has hit 1.0.0 and follows normal semver semantics? Maybe that is something that can already happen over there?

[tkf]

I think that's a reasonable concern. I brought this up in JuliaObjects/ConstructionBase.jl#6 (comment)