Mention upgrade_bundler.sh in README
Mention upgrade_bundler.sh in README

oeoeaio/openfoodnetwork,mkllnk/openfoodnetwork,Em-AK/openfoodnetwork,mkllnk/openfoodnetwork,KateDavis/openfoodnetwork,Matt-Yorkley/openfoodnetwork,Em-AK/openfoodnetwork,Matt-Yorkley/openfoodnetwork,openfoodfoundation/openfoodnetwork,KateDavis/openfoodnetwork,Matt-Yorkley/openfoodnetwork,mkllnk/openfoodnetwork,openfoodfoundation/openfoodnetwork,mkllnk/openfoodnetwork,Em-AK/openfoodnetwork,Matt-Yorkley/openfoodnetwork,oeoeaio/openfoodnetwork,lin-d-hop/openfoodnetwork,openfoodfoundation/openfoodnetwork,lin-d-hop/openfoodnetwork,Em-AK/openfoodnetwork,lin-d-hop/openfoodnetwork,oeoeaio/openfoodnetwork,openfoodfoundation/openfoodnetwork,oeoeaio/openfoodnetwork,KateDavis/openfoodnetwork,lin-d-hop/openfoodnetwork,KateDavis/openfoodnetwork