Better EmailAttachment initializer

• Add more convenient EmailAttachment initializer.
• Check for attachment size
• Update README

Fix package version number

• Fix package version number
• Add GitHub Action for Linux/Mac builds

v1.1: Merge pull request #12 from vamsii777/fix/build

• Add Broadcast support
• Add Idempotency Key in sending email

DomainTLSMode

• Introduced DomainTLSMode enum for TLS policy options in DomainUpdate.
• Introduced a DomainDeleteResponse model to match the API's delete response.

v1.0.6: Merge pull request #6 from hsharghi/scheduled

fix initializing EmailAddress from string literal.

Update/Cancel scheduled emails

Update/Cancel scheduled emails via resend client

Add scheduledAt to send method

Now emails can be sent later using scheduledAt parameter.

Add `API Keys` and `Domains` APIs

Add API Keys and Domains APIs

v1.0.2

Update README and tags

Add license

Add License