Change readme and banner text to reflect the current state

ptomato · ptomato · commit 2633e5a3246a · 2020-06-15T14:35:10.000-07:00
The "does not reflect the current consensus" text was mainly to indicate
that the consensus included calendars while the polyfill did not. That
has now changed.

We should now emphasize that the API is experimental and the polyfill
should not be used in production, and give a prominent link to where
feedback can be given.
diff --git a/README.md b/README.md
@@ -48,6 +48,10 @@ The specification text can be found [here](https://tc39.es/proposal-temporal/).
 A complete polyfill can be found [here](./polyfill).
 When viewing the [reference documentation](https://tc39.es/proposal-temporal/docs/index.html), the polyfill is automatically loaded in your browser, so you can try it out by opening your browser's developer tools.
 
+**NOTE:** We encourage you to experiment with the polyfill, but don't use it in production!
+The API will change before the proposal reaches Stage 3, based on feedback that we receive during this time.
+Please give us your feedback in the [issue tracker](https://github.com/tc39/proposal-temporal/issues).
+
 ## Cookbook
 
 A cookbook to help you get started and learn the ins and outs of Temporal is available [here](./docs/cookbook.md)
diff --git a/docs/head.html.part b/docs/head.html.part
@@ -80,6 +80,7 @@
   </head>
   <body>
     <div class="banner">
-      <strong>This polyfill is a work in progress.</strong>
-      It does not represent the final API of this proposal, nor even the current consensus.
+      This proposal is <strong>experimental.</strong>
+      The API will change based on feedback that we get.
+      <strong>Do</strong> <a href="https://github.com/tc39/proposal-temporal/issues">give feedback</a>; <strong>don't</strong> use it in production!
     </div>
diff --git a/polyfill/README.md b/polyfill/README.md
@@ -2,6 +2,10 @@
 
 **Polyfill for [Proposal: Temporal](https://github.com/tc39/proposal-temporal)**
 
+**NOTE:** We encourage you to experiment with the polyfill, but don't use it in production!
+The API will change before the proposal reaches Stage 3, based on feedback that we receive during this time.
+Please give us your feedback in the [issue tracker](https://github.com/tc39/proposal-temporal/issues).
+
 Please run the polyfill with Node.js 12 or later.
 
 ## Import as a Module
