Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires react-parallel/streams dev-7a1bbef40f296a1e017a960729c7de54ea3e0af8 -> satisfiable by react-parallel/streams[dev-7a1bbef40f296a1e017a960729c7de54ea3e0af8]. - react-parallel/streams dev-7a1bbef40f296a1e017a960729c7de54ea3e0af8 requires react-parallel/event-loop ^2@dev -> found react-parallel/event-loop[2.x-dev] but it does not match your minimum-stability.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires react-parallel/streams dev-40/merge, found react-parallel/streams[dev-7a1bbef40f296a1e017a960729c7de54ea3e0af8] but it does not match the constraint.