message: Update graphql-tools revision again to fix a trailing comma bug.
diff: @@ -18,7 +18,7 @@ if [ ! -d graphql-tools-src ]
  then
  git clone https://github.com/apollographql/graphql-tools.git
  pushd graphql-tools
  - git reset --hard d3073987a4e00ed1bf59f709232e0a614f1b7edb
  + git reset --hard 90e37c477225e56edfacc9f2a1a8336c766de93b
  popd
  mv graphql-tools/src \
  graphql-tools-src
  