Added 2.0.1 upgrade guide and changed the constants ready.
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
index 6ac333a..99c261e 100644
--- a/system/core/CodeIgniter.php
+++ b/system/core/CodeIgniter.php
@@ -32,7 +32,7 @@
  *  Define the CodeIgniter Version
  * ------------------------------------------------------
  */
-	define('CI_VERSION', '2.0');
+	define('CI_VERSION', '2.0.1');
 
 /*
  * ------------------------------------------------------