chore(Grid): revert storybook to 5.2.1

Author: zachhardesty7

.yarn/offline-mirror/@babel-core-7.7.7.tgz

@@ -65,15 +65,15 @@
     "@babel/preset-env": "^7.4.3",
     "@babel/preset-react": "^7.0.0",
     "@carbon/test-utils": "^10.6.0-rc.0",
-    "@storybook/addon-a11y": "^5.2.3",
-    "@storybook/addon-actions": "^5.2.3",
-    "@storybook/addon-info": "^5.2.3",
-    "@storybook/addon-knobs": "^5.2.3",
-    "@storybook/addon-links": "^5.2.3",
-    "@storybook/addon-storysource": "^5.2.3",
-    "@storybook/addons": "^5.2.3",
-    "@storybook/react": "^5.2.3",
-    "@storybook/source-loader": "^5.2.3",
+    "@storybook/addon-a11y": "^5.2.1",
+    "@storybook/addon-actions": "^5.2.1",
+    "@storybook/addon-info": "^5.2.1",
+    "@storybook/addon-knobs": "^5.2.1",
+    "@storybook/addon-links": "^5.2.1",
+    "@storybook/addon-storysource": "^5.2.1",
+    "@storybook/addons": "^5.2.1",
+    "@storybook/react": "^5.2.1",
+    "@storybook/source-loader": "^5.2.1",
     "all-contributors-cli": "^5.2.1",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^23.6.0",

.yarn/offline-mirror/@babel-generator-7.7.7.tgz

@@ -12,6 +12,7 @@ import Grid from './Grid';
 import { blue, gray } from '@carbon/colors';
 import './_Grid-story.scss';
 
+// FIXME: should be unnecessary past Storybook 5.2.2
 const handleUndefStr = str => {
   if (str === 'undefined') return undefined;
   return str;