Fix README.md typos
Fix README.md typos
TimothyGu/acorn,ternjs/acorn,marijnh/acorn,TimothyGu/acorn,mysticatea/acorn,mysticatea/acorn,TimothyGu/acorn,marijnh/acorn,mysticatea/acorn,ternjs/acorn,ternjs/acorn,marijnh/acorn