Fix typo in package.json: peerDependency -> peerDependencies

Author: Aya-OURAG-Speedykom

package.json

@@ -15,7 +15,7 @@
     "start": "rollup -c -w",
     "prepare":"npm run build"
   },
-  "peerDependency": {
+  "peerDependencies": {
     "react-intl": "^5.8.1"
   },
   "devDependencies": {