changelog & unique ids

UNRELEASED.md

@@ -18,6 +18,7 @@ Use [the changelog guidelines](https://git.io/polaris-changelog-guidelines) to f
 
 - Made the `action` prop optional on `EmptyState` ([#1583](https://github.com/Shopify/polaris-react/pull/1583))
 - Prevented Firefox from showing an extra dotted border on focused buttons ([#1409](https://github.com/Shopify/polaris-react/pull/1409))
+- Added `resolveItemId` prop to `ResourceList` which is used in the new multiselect feature ([#1261](https://github.com/Shopify/polaris-react/pull/1261))
 
 ### Bug fixes
 

src/components/ResourceList/README.md

@@ -663,8 +663,8 @@ class ResourceListExample extends React.Component {
         location: 'Decatur, USA',
       },
       {
-        id: 256,
-        url: 'customers/256',
+        id: 246,
+        url: 'customers/246',
         name: 'Ellen Ochoa',
         location: 'Los Angeles, USA',
       },
@@ -675,8 +675,8 @@ class ResourceListExample extends React.Component {
         location: 'Arizona, USA',
       },
       {
-        id: 341,
-        url: 'customers/341',
+        id: 349,
+        url: 'customers/349',
         name: 'Haden Jerado',
         location: 'Decatur, USA',
       },