[eslint config] [base] Update `ecmaVersion` to `2016`.
[eslint config] [base] Update `ecmaVersion` to `2016`.
getjll/JavaScript-Style-Guide,webcoding/javascript-style-guide,addshoppers/javascript,LodoSoftware/javascript-style-guide,allanfish/javascript,ljharb/javascript,nulogy/javascript,practicefusion/javascript,LodoSoftware/javascript-style-guide,cloudability/javascript-style-guide,appcom-interactive/javascript,airbnb/javascript,xalexec/javascript,naustudio/javascript,pokelondon/javascript,bl00mber/javascript,naustudio/javascript,whichdigital/javascript-coding-standards