fix Model.changed method arguments description

[vologab]

https://github.com/sequelize/sequelize/blob/master/lib/model.js#L3382

[codecov-io]

Codecov Report

Merging #269 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #269   +/-   ##
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  Coverage   96.71%   96.71%           
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  Files         115      115           
  Lines        1004     1004           
  Branches      129      129           
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  Hits          971      971           
  Misses         15       15           
  Partials       18       18

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[RobinBuschmann]

Hey @vologab, thanks for contributing. Can you provide a link where this is documented? Thank you :)

[vologab]

Hi @RobinBuschmann. I've put link to sequelize repo inside commit message:
https://github.com/sequelize/sequelize/blob/master/lib/model.js#L3382.
Also issue when we have to use second param: sequelize/sequelize#2862

[RobinBuschmann]

Sry, I have overseen that.