docs(README.md): move badge location for displaying on www.npmjs.com
docs(README.md): move badge location for displaying on www.npmjs.com

ksavenkov/react-google-maps,jossi87/react-google-maps,RishabhJain96/react-google-maps,RishabhJain96/react-google-maps,tomchentw/react-google-maps,jossi87/react-google-maps,joshcarr/react-google-maps