fix path to index.html in hook

Author: nuest

hooks/post_checkout

@@ -5,4 +5,4 @@ set -e
 PACKAGE_VERSION=$(cat README.md | grep -i --after-context 2 "platform version" | tail -1)
 echo Add version tag $PACKAGE_VERSION to index.html
 
-sed -i "s/#dev#/$PACKAGE_VERSION/g" ../client/index.html
+sed -i "s/#dev#/$PACKAGE_VERSION/g" client/index.html