Fix compressing xz archive

Signed-off-by: Michal Čihař <michal@cihar.com>

scripts/create-release

@@ -10,6 +10,7 @@ fi
 # Grab version
 version=`DJANGO_SETTINGS_MODULE=weblate.settings_example python -c 'import weblate; print weblate.VERSION' | sed 's/-dev//'`
 namever=weblate-$version
+tarver=Weblate-$version
 
 # What are we going to build?
 if [ "x$1" = "x--tag" ] ; then
@@ -24,4 +25,4 @@ fi
 ./setup.py sdist --formats bztar,gztar,zip
 
 # Build tarballs
-zcat dist/$namever.tar.gz | xz > dist/$namever.tar.xz
+zcat dist/$tarver.tar.gz | xz > dist/$tarver.tar.xz