typo

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1636808 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/README.txt b/README.txt
index 9b1e6a4..f2c1080 100644
--- a/README.txt
+++ b/README.txt
@@ -1,6 +1,6 @@
 
 ###### Introduction ######
-Hupa is an Rich IMAP-based Webmail application written in GWT.
+Hupa is a Rich IMAP-based Webmail application written in GWT.
 
 Hupa has been entirely written in java to be coherent with the language used in the James project.
 It has been a development reference using GWT good practices (MVP pattern and Unit testing)