Merge pull request plotly#338 from plotly/proptypes-tab-fix

Change `React.PropTypes` to just `PropTypes` in `Tabs.children`.

Author: rmarren1

packages/dash-core-components/dash_core_components/dash_core_components.dev.js

@@ -374,9 +374,9 @@ Tabs.propTypes = {
     /**
      * Array that holds Tab components
      */
-    children: React.PropTypes.oneOfType([
-        React.PropTypes.arrayOf(React.PropTypes.node),
-        React.PropTypes.node,
+    children: PropTypes.oneOfType([
+        PropTypes.arrayOf(PropTypes.node),
+        PropTypes.node,
     ]),
 
     /**