Fix composer to use the tidle operator

It is highly recommended to not use > X.X.X due to the way [semantic versioning](http://semver.org/). You want to restrict the scope of the packages you're utilizing.

If illuminate/support releases 5.0 your composer install would take potentially incompatible API changes.

The [tilde operator](https://getcomposer.org/doc/01-basic-usage.md#package-versions) in this case is equivalent to, >=4.0,<4.0