Use @babel/parser for tests to support typescript syntax

Author: vhfmag

__tests__/helper.js

@@ -1,6 +1,6 @@
 import getProp from '../src/getProp';
 
-const parser = require('babylon');
+const parser = require('@babel/parser');
 
 function parse(code) {
   return parser.parse(code, {

package.json

@@ -16,6 +16,7 @@
   "devDependencies": {
     "@babel/cli": "^7.0.0",
     "@babel/core": "^7.0.0",
+    "@babel/parser": "^7.3.2",
     "@babel/polyfill": "^7.0.0",
     "@babel/preset-env": "^7.0.0",
     "babel-core": "^7.0.0-bridge.0",