chore: add missing peer dependency

Author: dobromir-hristov

package.json

@@ -33,6 +33,7 @@
   "dependencies": {
     "babel-core": "^6.26.0",
     "babel-eslint": "^8.2.2",
+    "babel-helper-vue-jsx-merge-props": "^2.0.3",
     "babel-loader": "^7.1.3",
     "babel-plugin-syntax-jsx": "^6.18.0",
     "babel-plugin-transform-decorators-legacy": "^1.3.4",