fix: added prop-types to peerDependencies

Author: Clauderic Demers

package.json

@@ -54,6 +54,7 @@
     "prop-types": "^15.5.7"
   },
   "peerDependencies": {
+    "prop-types": "^15.5.7",
     "react": "^0.14.0 || ^15.0.0 || ^16.0.0",
     "react-dom": "^0.14.0 || ^15.0.0 || ^16.0.0"
   },