update peerDependencies

Author: dburles

packages/match-media/package.json

@@ -22,7 +22,8 @@
     "react": "^16.9.0"
   },
   "peerDependencies": {
-    "react": "^16.9.0",
-    "theme-ui": "^0.3.0"
+    "@theme-ui/core": "^0.4.0-alpha.0",
+    "@theme-ui/css": "^0.4.0-alpha.0",
+    "react": "^16.9.0"
   }
 }