Updated packages

Author: Anders Hassis

package.json

@@ -87,6 +87,9 @@
     "webpack-dev-server": "^1.14.1",
     "yargs": "^4.8.1"
   },
+  "dependencies": {
+    "prop-types": "^15.5.8"
+  },
   "release-script": {
     "bowerRepo": "git@github.com:react-bootstrap/react-router-bootstrap-bower.git"
   }