Update style of risk measure code.

[odow]

No description provided.

[codecov]

Codecov Report

Merging #165 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   89.46%   89.48%   +0.01%     
==========================================
  Files          31       31              
  Lines        1433     1426       -7     
==========================================
- Hits         1282     1276       -6     
+ Misses        151      150       -1

Impacted Files	Coverage Δ
src/risk_measures/Wasserstein.jl	100% <100%> (ø)	⬆️
src/risk_measures/ConvexCombination.jl	100% <100%> (ø)	⬆️
src/risk_measures/riskmeasures.jl	100% <100%> (ø)	⬆️
src/defaultvaluefunction.jl	98.9% <100%> (ø)	⬆️
src/risk_measures/AVaR.jl	100% <100%> (ø)	⬆️
src/price_interpolation/price_interpolation.jl	97.93% <100%> (ø)	⬆️
src/risk_measures/DRO.jl	100% <100%> (+3.03%)	⬆️
src/risk_measures/WorstCase.jl	100% <100%> (ø)	⬆️
src/risk_measures/Expectation.jl	100% <100%> (ø)	⬆️

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