README: Use markdown tables
README: Use markdown tables

ustuehler/postfix-dovecot-cookbook,RavenB/postfix-dovecot-cookbook,onddo/postfix-dovecot-cookbook,onddo/postfix-dovecot-cookbook,RavenB/postfix-dovecot-cookbook,onddo/postfix-dovecot-cookbook,RavenB/postfix-dovecot-cookbook,zuazo/postfix-dovecot-cookbook,zuazo/postfix-dovecot-cookbook,ustuehler/postfix-dovecot-cookbook,ustuehler/postfix-dovecot-cookbook