v0.3.0

Added

• MessageBuilder#set_disable_link_preview and message send support for the disable_link_preview query param.
• Chat pinning helpers:
  • Resources::Chats#pin_message
  • Resources::Chats#get_pinned_message
  • Resources::Chats#unpin_message
• KeyboardRowBuilder#add_clipboard for clipboard buttons.
• Client::SECRET_HEADER and Client#webhook_secret_valid? for webhook secret validation.
• Tests for chat pinning, clipboard buttons, message link preview control, and webhook secret validation.

Changed

• Webhook examples and docs now mirror the upstream Go client flow: validate the secret header before parsing the payload.
• API coverage docs now mark chat pinning and disable_link_preview as supported.

Breaking

• None.