Add prop-types to externals for UMD build

Clauderic Demers · Clauderic Demers · commit 74aa4539565a · 2017-04-12T07:38:22.000-04:00
diff --git a/nwb.config.js b/nwb.config.js
@@ -5,7 +5,8 @@ module.exports = {
     umd: {
       global: 'VirtualList',
       externals: {
-        react: 'React'
+        react: 'React',
+        'prop-types': 'PropTypes',
       }
     }
   },
