add yarn.lock to gitignore
add yarn.lock to gitignore

folksy-squid/Picky-Notes,inspiredtolive/Picky-Notes,folksy-squid/Picky-Notes,derektliu/Picky-Notes,derektliu/Picky-Notes,inspiredtolive/Picky-Notes,inspiredtolive/Picky-Notes,folksy-squid/Picky-Notes,derektliu/Picky-Notes