Fix import in testcase

Author: danez

src/__tests__/__snapshots__/main-test.js.snap

@@ -982,10 +982,9 @@ Object {
   "props": Object {
     "color": Object {
       "description": "",
-      "required": false,
+      "required": true,
       "type": Object {
-        "name": "custom",
-        "raw": "PropTypes.string.isRequired",
+        "name": "string",
       },
     },
     "id": Object {
@@ -996,8 +995,7 @@ Object {
       "description": "",
       "required": false,
       "type": Object {
-        "name": "custom",
-        "raw": "PropTypes.string",
+        "name": "string",
       },
     },
   },

src/__tests__/fixtures/component_18.js

@@ -1,5 +1,6 @@
 
 import React from 'react';
+import PropTypes from 'prop-types';
 import extendStyles from 'enhancers/extendStyles';
 
 type Props = $ReadOnly<{|
@@ -19,4 +20,4 @@ ColoredView.defaultProps = {
   id: 'test-forward-ref-default'
 }
 
-module.exports = extendStyles(ColoredView);
+module.exports = extendStyles(ColoredView);