Docs: fixed wrong build command (#18)

diff --git a/HOWTOBUILD.txt b/HOWTOBUILD.txt
index 07cf910..d37aeb5 100644
--- a/HOWTOBUILD.txt
+++ b/HOWTOBUILD.txt
@@ -26,7 +26,7 @@
 * cd to Chainsaw project checkout directory
 	mvn site:site
-	mvn install
+	mvn install -P packaging
 This will automatically build and assemble the Chainsaw distribution which includes a .sh & .bat shell script to run Chainsaw.  You can then run Chainsaw as follows: