Fix react-cache UMD build (#14047)

bvaughn · web-flow · commit 1ae3f29c2094 · 2018-10-31T11:16:03.000-07:00
diff --git a/packages/react-cache/package.json b/packages/react-cache/package.json
@@ -8,7 +8,8 @@
     "LICENSE",
     "README.md",
     "index.js",
-    "cjs/"
+    "cjs/",
+    "umd/"
   ],
   "peerDependencies": {
     "react": "^16.3.0-alpha.1"
