Update Pico::VERSION

Pico::VERSION_ID isn't updated because this is a alpha release.

lib/Pico.php

@@ -49,7 +49,7 @@ class Pico
      *
      * @var string
      */
-    const VERSION = '3.0.0-alpha.1';
+    const VERSION = '3.0.0-alpha.2';
 
     /**
      * Pico version ID