Update dependencies

• Additional URL preview bug fixes. Thanks @jlubeck for reporting!
• Update to Flutter 2.2

• Fix various URL preview bugs (see https://pub.dev/packages/flutter_link_previewer/changelog)
• Add an option to disable URL preview. Thanks @Elementarereigniss for the PR!
• Add portugese localization. Thanks @BerkSpar for the PR!
• Update dependencies

• BREAKING CHANGE: onFilePressed is replaced with onMessageTap to support tap event for different message types. See usage example.
• Added onMessageLongPress callback, similar to the onMessageTap.
• Added disableImageGallery parameter to optionally disable the image gallery on the image tap.
• Added subtitle2Color to the theme, which is used to color date dividers in the chat. Thanks @sarbogast for the PR!
• Fixed issues with link preview

Hide the attachment button if onAttachmentPressed is not passed. Thanks @devfelipereis for noticing!

Initial release