0.5.1

We are aiming for weekly releases of WebChat. Here's what's notably new this week:

• Better behaved carousels. Now they can be as wide as you want.
• Receipt card now shows subtitle and buttons
• If your Direct Line token goes stale, your website can supply a new one.
• Fixed a bug where specified locale was ignored.
• Longer timeouts when calling Direct Line. Now your C# bot can take its time coming up with a clever response.