Version 1.4.0

• support version 1.4 of messenger api
• new setPersistentMenu API aligned with v1.4
• added setGreetingText, setAccountLinkingURL, setTargetAudience API
• aligned all thread settings to the new profile API
• added support for filedata upload in the sendAttachment
• added support for the new upload attachment API,
• support for new image_aspect_ratio in generic template