Update Plaid.php

Update Plaid.php

Update Plaid.php

Adding test to check for InvalidArgumentException when an unsupported…

… interval is given.

Fixing broken tests when addressing account filters bug.

Adding documentation about new creatLinkToken method.

Updating docs with RecipientAddress information.

Updating docs with new webhook method: getWebhookVerificationKey.

Fixing typo in docs for the updateWebhook() method.

Cleaning up whitespace.

Removing unsupported "include_insights" on getAssetReportPdf() method.

Updating documentation to reflect change in method signature.