Clear all steps #193

[pm122uk]

Describe the bug
I want to clear all steps in mid-conversation if a user has selected a particular option. Since the conversation is private.

To Reproduce
Simply use the chatbot application and select a particular option that I have programmed.
Expected behavior
I want the conversation history to be erased. e.g. previous messages and selections wiped. Without the user having to press a clear screen button.
It's the end of the conversation, I just need to reset the screen.
I have tried to push the messages off the screen with new messages but this is not a good solution.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[LucasBassetti]

To restart the conversation, render the chatbot with a new key (e.g. <ChatBot key={conversationId} steps={steps} />); if cache is enabled, also clear it with localStorage.removeItem(cacheName). This is now documented in the README.

Closing as part of the maintenance pass in #392. Feel free to comment if it doesn't work for you.