v6.1.3

• Minor security patch - Thanks goes to the Wordfence Research Team for locating and disclosing the issue.
• Cleared API/Account transient data when API key has changed.
• Refactored our shortcode function to abort early, when no fields are present (inline or not).
• Added labels-hidden class to the submit button <span></span> element so we can better style inline forms when all labels are hidden.