Fix README file typo
Fix README file typo

acm-nonsense/467-nonsense-impl1,CristinaFoltea/alchemyapi_node,kauffecup/alchemyapi_node,AlchemyAPI/alchemyapi_node,JFerguson576/alchemyapi_node,vinh3928/alchemyapi_node,tobha/alchemynode,acm-nonsense/467-nonsense-impl1,digitalartcrew/alchemyapi_node,weitingchou/alchemy_demo,K-Phoen/node-alchemyapi,steveherschleb/sdk_javascript,pcchiu524/mayday_alchemy