Merge pull request #1868 from 6eDesign/master

Small update to allow class directives to work in IE11

Author: Rich-Harris

src/shared/dom.js

@@ -239,5 +239,5 @@ export function addResizeListener(element, fn) {
 }
 
 export function toggleClass(element, name, toggle) {
-	element.classList.toggle(name, !!toggle);
+	element.classList[toggle ? 'add' : 'remove'](name);
 }