Correct the Docblock at OmiseApiResource::isDestroy() method.

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1. Objective

To correct a return tag (@return) in the OmiseApiResource::isDestroy() method's Docblock.

Related information:
Related issue(s): #43

2. Description of change

• Change @return OmiseApiResource to @return bool|null

3. Quality assurance

This change wasn't effect to any part of an implementation code.

By the way, the following code will shows bool(true).
Note, you must have at least 1 customer object to test the following code.

$customers = OmiseCustomer::retrieve();
$customer  = OmiseCustomer::retrieve($customers['data'][0]['id']);
$customer->destroy();

var_dump($customer->isDestroyed()); exit;

4. Impact of the change

No impact.

5. Priority of change

Normal.

6. Additional Notes

No.

[guzzilar]

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