OptimisticLocking property: number --> number|string

[IzikLisbon]

http://docs.sequelizejs.com/manual/tutorial/models-definition.html

// Enable optimistic locking.  When enabled, sequelize will add a version count attribute
// to the model and throw an OptimisticLockingError error when stale instances are saved.
// Set to true or a string with the attribute name you want to use to enable.

IDefineOptions: as commented above -Set to true or a string.
Model.d.ts: if a user sets the version in IDefineOptions to a string (or not set it at all) it is probably to free the version field for something else and in that case it should not be forced to a number (This is the motivation for this pull request - I had a version field of type string which caused a build break).

[codecov-io]

Codecov Report

Merging #86 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #86   +/-   ##
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  Coverage   95.65%   95.65%           
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  Files          66       66           
  Lines         759      759           
  Branches      106      106           
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  Hits          726      726           
  Misses         11       11           
  Partials       22       22

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[RobinBuschmann]

@IzikLisbon Hey, thanks for contributing. What does "something else" mean for Mode.d typings? What else could it be than a boolean, string or a number? Thank you

[IzikLisbon]

@RobinBuschmann It can be whatever the user decides it to be. Once the user is setting version in IDefineOption to a string, the version in Mode.d.ts can be of any type. Most likely that it will be a string or a number but there is no reason to force it.

[RobinBuschmann]

Fair enough. Thanks again.

[Jendorski]

I cannot find IDefineOptions in sequelize-typescript ver ^2..1.3

import { IDefineOptions } from 'sequelize-typescript/lib/interfaces/IDefineOptions';