Add historical note for Python 2.2.3
diff --git a/LICENSE b/LICENSE
index 180898c..c5b5923 100644
--- a/LICENSE
+++ b/LICENSE
@@ -41,6 +41,7 @@
     2.1.3           2.1.2       2002        PSF         yes
     2.2.1           2.2         2002        PSF         yes
     2.2.2           2.2.1       2002        PSF         yes
+    2.2.3           2.2.2       2003        PSF         yes
     2.3             2.2.2       2002-2003   PSF         yes
 
 Footnotes: