Corrected gem name in install instructions
Corrected gem name in install instructions

fcheung/tire,iamrahulroy/retire,mavenlink/retire,rubydubee/retire,mikepb/tire,dbose/retire,HenleyChiu/tire,alphagov/tire,tklee/tire_shiphawk,karmi/retire,fairfaxmedia/tire,doximity/tire,Telmate/tire,zaharpecherin/retire,brijeshgpt7/retire,fabn/retire,1776/tire,ChapterMedia/tire,elbuo8/retire