Rename linear_nondec model

[bezes]

Closes #58

[codecov-io]

Codecov Report

Merging #59 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #59   +/-   ##
=======================================
  Coverage   83.75%   83.75%           
=======================================
  Files           6        6           
  Lines        1317     1317           
=======================================
  Hits         1103     1103           
  Misses        214      214

Impacted Files	Coverage Δ
anticipy/forecast_models.py	86.88% <100%> (ø)	⬆️

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