Scrollable chat

🚀 New Feature:

• Made the conversation scrollable (Paul.O'Flaherty)

This is a temporary fix and is only currently supported with a mousewheel

How to use:

• Add a isScrollable to the Chat component

    <div>
      <Chat historicMessages={historicMessages} messages={messagesForConversation} turnOffLoop isScrollable />
    </div>

🐛 Bug Fixes:

• Fixed #17: Showing some messages twice (Paul.O'Flaherty)