README - fix ant target order for example of building with a specific build number (was not including elemental)

Change-Id: I4553150d4ae890a81bb7182de1dde84795e823a8

README.md

diff --git a/README.md b/README.md
index dd3a6d5..212699b 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@
 
    if you want to specify a different version number run:
 
-   `$ ant elemental clean dist-dev -Dgwt.version=x.x.x`
+   `$ ant clean elemental dist-dev -Dgwt.version=x.x.x`
 
  - To compile everything including examples you have to run