FlashMessage now expects separate children and isError props, rather than a single message prop. This allows the component to be used without needing to use redux-flash. It also no longer wraps content in a <p> tag by default.
You should update any instances of FlashMessage accordingly.
(Note: this change is not necessary if you are using FlashMessageContainer instead of FlashMessage directly.)
// Before, where "message" was a redux-flash message object:
<FlashMessage message={message} />
// After:
<FlashMessage
isError={message.isError}
{...message.props}
>
<p>
{message.message}
</p>
</FlashMessage>