Update README.markdown to have correct installation instructions
Update README.markdown to have correct installation instructions
jeremyvdw/mailchimp-gem,daveworth/mailchimp-gem,bsedat/mailchimp-gem,herimedia/mailchimp-gem,demental/mailchimp-gem,olivierlacan/mailchimp-gem,seangaffney/mailchimp-gem,steel/mailchimp-gem,bsimpson/mailchimp-gem,wallace/mailchimp-gem,iloveitaly/mailchimp-gem,jkriss/mailchimp-gem