fix es seasonal upper bound

[guilhermebodin]

No description provided.

[codecov]

Codecov Report

Merging #288 (a4e3fd9) into master (b1723e7) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #288   +/-   ##
=======================================
  Coverage   93.88%   93.88%           
=======================================
  Files          33       33           
  Lines        3043     3043           
=======================================
  Hits         2857     2857           
  Misses        186      186           

Impacted Files	Coverage Δ
src/hyperparameters.jl	92.80% <100.00%> (ø)
src/models/exponential_smoothing.jl	100.00% <100.00%> (ø)

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