added Peerby to list of organizations that use this guide
added Peerby to list of organizations that use this guide

codelegant/JavaScript,allanfish/javascript,xalexec/javascript,ljharb/javascript,codelegant/JavaScript,airbnb/javascript,practicefusion/javascript,webcoding/javascript-style-guide,cloudability/javascript-style-guide,getjll/JavaScript-Style-Guide,appcom-interactive/javascript,naustudio/javascript,LodoSoftware/javascript-style-guide,bl00mber/javascript,addshoppers/javascript,pokelondon/javascript,nulogy/javascript,naustudio/javascript,whichdigital/javascript-coding-standards,LodoSoftware/javascript-style-guide