update dependency on concurrently #928
Description
concurrently 6.x depends on rxjs 6, and every version of rxjs is a massive dependency. Most other projects - including this one! - depend on rxjs 7 now, so having an indirect dependency on rxjs 6 forces them to include the same huge package twice.
Updating to concurrently 7.2.2 or higher would resolve this. #590 #848