fix: member name in TextPrompt rendering (#465)

Co-authored-by: James Garbutt <[email protected]>

Author: utsav-bhandari

.changeset/cool-forks-flash.md

@@ -0,0 +1,5 @@
+---
+"@clack/core": patch
+---
+
+Update the core README.md to reflect the internal member name change when rendering a TextPrompt (`userInputWithCursor`).

packages/core/README.md

@@ -11,7 +11,7 @@ import { TextPrompt, isCancel } from '@clack/core';
 
 const p = new TextPrompt({
   render() {
-    return `What's your name?\n${this.valueWithCursor}`;
+    return `What's your name?\n${this.userInputWithCursor}`;
   },
 });