Update to Faker 1.4.0

The changes work for me, not sure what else may be affected by the Faker 1.4 update.

The changes got rid of these errors:

Composer Error:
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  Problem 1
    - Installation request for skovachev/fakefactory dev-master -> satisfiable by skovachev/fakefactory[dev-master].
    - skovachev/fakefactory dev-master requires fzaninotto/faker 1.3.*@dev -> no matching package found.

Laravel Error:
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randomNumber() generates numbers of fixed width. To generate numbers between two boundaries, use numberBetween() instead.