Add `operatorsAliases` option to the Sequelize constructor options argument

[modulitos]

The Sequelize constructors accepts an options argument, which can have a operatorsAliases key, found in the table in the docs here: http://docs.sequelizejs.com/class/lib/sequelize.js~Sequelize.html#instance-constructor-constructor

This options should be supported in the Sequelize type definitions as well.

[modulitos]

Note that if operatorsAliases is not set in the options passed to our Sequelize constructor, then it's default value is set to true. This causes the following error when starting the application:

sequelize deprecated String based operators are now deprecated. Please use Symbol based operators for better security, read more at http://docs.sequelizejs.com/manual/tutorial/querying.html#operators at node_modules/sequelize/lib/sequelize.js:236:13

Setting operatorsAliases to false resolves this security warning. It seems like this will get fixed in Sequelize v5, according to the code here: https://github.com/sequelize/sequelize/blob/master/lib/sequelize.js#L233-L240

So it would be nice to resolve this warning without breaking the compilation.

[SimonSchick]

@felixfbecker I believe this was added?