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Adds Laravel 9 support.

Adds PHP8 support.

This release aims to add a native laravel 8 support. To do this the following changes were made:

1. Add namespace Database\Seeders; namespace to the seed stub.
2. Change config to point to the default database/seeders/ directory over the laravel 7 database/seeds
3. Change the Stubs directory to stubs

Since some breaking changes were introduced, the version is bumped to a major release.

Added support for Laravel 8

Added Laravel 7.0 support

• Added Laravel 6.0 support
• Updated the documentation on how to use the orderby and direction parameters

Added chunksize optional parameter which defines the size of data chunks for each insert query. Helps with issue described in https://github.com/orangehill/iseed/issues/4#issuecomment-380324859

Optionally specify a prefix or suffix for the Seeder class name and file name. This is useful if you want to create an additional seed for a table that has an existing seed without overwriting the existing one.