Update storybook to use latest (^5.1.3) (Shopify#1666)

* Update storybook to use latest (^5.1.3)

* Update UNRELEASED.md

UNRELEASED.md

@@ -22,6 +22,8 @@ Use [the changelog guidelines](https://git.io/polaris-changelog-guidelines) to f
 
 ### Development workflow
 
+- Updated Storybook to `v5.1.3` ([#1666](https://github.com/Shopify/polaris-react/pull/1666))
+
 ### Dependency upgrades
 
 ### Code quality

package.json

@@ -96,14 +96,7 @@
     "@shopify/jest-dom-mocks": "^2.1.1",
     "@shopify/js-uploader": "github:shopify/js-uploader",
     "@shopify/sewing-kit": "0.85.5",
-    "@storybook/addon-a11y": "5.1.0-rc.4",
-    "@storybook/addon-actions": "5.1.0-rc.4",
-    "@storybook/addon-backgrounds": "5.1.0-rc.4",
     "@storybook/addon-console": "^1.1.0",
-    "@storybook/addon-notes": "5.1.0-rc.4",
-    "@storybook/addon-viewport": "5.1.0-rc.4",
-    "@storybook/react": "5.1.0-rc.4",
-    "@storybook/theming": "5.1.0-rc.4",
     "@types/enzyme": "^3.1.14",
     "@types/enzyme-adapter-react-16": "^1.0.3",
     "@types/lodash": "^4.14.108",
@@ -185,6 +178,13 @@
     "@shopify/polaris-tokens": "^2.6.0",
     "@shopify/react-compose": "^1.0.0",
     "@shopify/useful-types": "^1.2.4",
+    "@storybook/addon-a11y": "^5.1.3",
+    "@storybook/addon-actions": "^5.1.3",
+    "@storybook/addon-backgrounds": "^5.1.3",
+    "@storybook/addon-notes": "^5.1.3",
+    "@storybook/addon-viewport": "^5.1.3",
+    "@storybook/react": "^5.1.3",
+    "@storybook/theming": "^5.1.3",
     "@types/react": "^16.4.7",
     "@types/react-dom": "^16.0.6",
     "@types/react-transition-group": "^2.0.7",