KNOX-2888 - Update gateway-version to 2.1.0 in build.xml (#735)

diff --git a/build.xml b/build.xml
index c424cf4..23a8772 100644
--- a/build.xml
+++ b/build.xml
@@ -25,7 +25,7 @@
 <property name="gateway-project" value="knox"/>
 <property name="gateway-artifact" value="knox"/>
 <property name="knoxshell-artifact" value="knoxshell"/>
-<property name="gateway-version" value="2.0.0-SNAPSHOT"/>
+<property name="gateway-version" value="2.1.0-SNAPSHOT"/>
 <property name="release-manager" value="kminder"/>
 
 <property name="gateway-home" value="${gateway-artifact}-${gateway-version}"/>