prompts: Add missing onRender method to PromptObject

The new dependency on `kleur` has been merged; see microsoft/DefinitelyTyped-tools#573.

This method is mentioned in the `README`: https://github.com/terkelg/prompts/blob/a0c1777ae86d04e46cb42eb3af69ca74ae5d79e2/readme.md#-prompt-objects

types/prompts/index.d.ts

@@ -6,6 +6,7 @@
 //                 theweirdone <https://github.com/theweirdone>
 //                 whoaa512 <https://github.com/whoaa512>
 //                 John Reilly <https://github.com/johnnyreilly>
+//                 Christopher Hiller <https://github.com/boneskull>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.9
 
@@ -14,6 +15,7 @@
 export = prompts;
 
 import { Readable, Writable } from 'stream';
+import { Kleur } from 'kleur';
 
 declare function prompts<T extends string = string>(
     questions: prompts.PromptObject<T> | Array<prompts.PromptObject<T>>,
@@ -83,6 +85,7 @@ declare namespace prompts {
         format?: PrevCaller<T, void> | undefined;
         validate?: PrevCaller<T, boolean | string | Promise<boolean | string>> | undefined;
         onState?: PrevCaller<T, void> | undefined;
+        onRender?: ((kleur: Kleur) => void) | undefined;
         min?: number | PrevCaller<T, number | Falsy> | undefined;
         max?: number | PrevCaller<T, number | Falsy> | undefined;
         float?: boolean | PrevCaller<T, boolean | Falsy> | undefined;

types/prompts/package.json

@@ -0,0 +1,6 @@
+{
+  "private": true,
+  "dependencies": {
+    "kleur": "^3.0.3"
+  }
+}