Update license field in package.json
Update license field in package.json

PeterDaveHello/hackmd,hackmdio/hackmd,jackycute/HackMD,hackmdio/hackmd,PeterDaveHello/hackmd,Yukaii/hackmd,hackmdio/hackmd,Yukaii/hackmd,jackycute/HackMD,PeterDaveHello/hackmd,Yukaii/hackmd,jackycute/HackMD