fix(package): update execa to version 0.6.2
fix(package): update execa to version 0.6.2

https://greenkeeper.io/

rstacruz/pnpm,pnpm/supi,pnpm/pnpm,rstacruz/pnpm,rstacruz/pnpm,pnpm/supi,pnpm/pnpm,pnpm/supi,pnpm/pnpm