laravel change column type

php artisan make:migration change_sometable_in_finance_table --table=finance

public function up()
{
    Schema::table('sometable', function (Blueprint $table) {
        $table->text('text')->change();
    });
}

// To drop a column, use the dropColumn method on the schema builder.
// Before dropping columns from a SQLite database, you will need to add
// the doctrine/dbal dependency to your composer.json file and run the
// composer update command in your terminal to install the library:

Schema::table('users', function (Blueprint $table) {
    $table->dropColumn('votes');
});

Schema::table('users', function (Blueprint $table) {
    $table->string('name', 50)->nullable()->change();
});

$table->string('foo')->nullable(false)->change();