Adjust code to Blue Style

[raphaelsaavedra]

This is a big one.

Main changes are removing blank spaces, indentation of line breaks, spacing in kwargs and type parameters, and mutating functions returning the objects they mutate.

[guilhermebodin]

Just fix the doctests

[codecov]

Codecov Report

Merging #205 into master will decrease coverage by 0.53%.
The diff coverage is 86.33%.

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
- Coverage   89.32%   88.79%   -0.54%     
==========================================
  Files          21       21              
  Lines        1387     1401      +14     
==========================================
+ Hits         1239     1244       +5     
- Misses        148      157       +9     

Impacted Files	Coverage Δ
src/optimizers.jl	100.00% <ø> (ø)
src/prints.jl	4.76% <0.00%> (-3.14%)	⬇️
src/filters/multivariate_kalman_filter.jl	66.40% <70.73%> (ø)
src/forecast.jl	89.58% <71.42%> (+0.94%)	⬆️
src/filters/univariate_kalman_filter.jl	73.33% <72.50%> (ø)
src/kalman_filter_and_smoother.jl	89.06% <75.00%> (ø)
src/hyperparameters.jl	90.32% <82.97%> (-4.06%)	⬇️
src/smoothers/kalman_smoother.jl	94.28% <91.30%> (ø)
src/models/arima.jl	96.10% <97.61%> (ø)
src/filters/regression_kalman_filter.jl	100.00% <100.00%> (ø)
... and 16 more

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