made non-interactivity more clear in readme

fixes #7

Author: splitbrain

README.md

@@ -10,7 +10,7 @@ It takes care of
 - **colored output**
 - **optional PSR3 compatibility**
 
-It is lightweight and has **no 3rd party dependencies**.
+It is lightweight and has **no 3rd party dependencies**. Note: this is for non-interactive scripts only. It has no readline or similar support.
 
 [![Build Status](https://travis-ci.org/splitbrain/php-cli.svg)](https://travis-ci.org/splitbrain/php-cli)
 
@@ -155,4 +155,4 @@ Messages from `warning` level onwards are printed to `STDERR` all below are prin
 
 The default log level of your script can be set by overwriting the `$logdefault` member.
 
-See `example/logging.php` for an example.
+See `example/logging.php` for an example.