tag with vX.X.X so travis recognises the version

release.sh

@@ -13,7 +13,7 @@ git add CHANGELOG.md DOCUMENTATION.md package.json
 git commit -m "release version $1"
 git checkout master
 git merge --no-ff -m "merge release/$1 into master" release/$1
-git tag $1
+git tag v$1
 git push
 git checkout develop
 git merge --no-ff -m "merge release/$1 into develop" release/$1