Correct docs config script (#145)

Author: nagix

scripts/docs-config.sh

@@ -8,4 +8,4 @@ VERSION=$(node -p -e "require('./package.json').version")
 MODE=$1
 TAG=$(tag_from_version "$VERSION" "$MODE")
 
-sed -i -e "s/VERSION/$TAG/g" "docs/.vuepress/config.js"
+sed -i -e "s/\"VERSION\"/\"$TAG\"/g" "docs/.vuepress/config.js"