docs: Fix typo "Writeable" => "Writable" in README.MD (#30)

Co-authored-by: Vitaly Makarevich <vitalymak@users.noreply.github.com>

README.md

@@ -28,7 +28,7 @@ Every option is optional.
 * `edit` Allow the user to edit the default value.
 * `terminal` Treat the output as a TTY, whether it is or not.
 * `input` Readable stream to get input data from. (default `process.stdin`)
-* `output` Writeable stream to write prompts to. (default: `process.stdout`)
+* `output` Writable stream to write prompts to. (default: `process.stdout`)
 
 If silent is true, and the input is a TTY, then read will set raw
 mode, and read character by character.