laravel/framework — pull request #4751 by nitintutlani (2014-06-18 08:06:39+00:00)
Title: Added support for change column in Schema #4745 #895

This will allow doing the following:
```
Schema::table('tests', function($table) {
$table->string('name')->nullable()->change();
});
```
New function `compileChange` enables changing columns in MySQL grammar. Similar implementation can be easily added to sqlite, sqlserver and postgres.