ci(travis): test on v7.6 instead of v7
ci(travis): test on v7.6 instead of v7

There is some issue with building native addons on v7.7

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