add setup.cfg, update _frontend version

luxwidget/_frontend.py

@@ -1,10 +1,10 @@
 #!/usr/bin/env python
 # coding: utf-8
-
+from ._version import __version__
 
 """
 Information about the frontend package of the widgets.
 """
 
 module_name = "luxwidget"
-module_version = "^0.0.1"
+module_version = __version__

setup.cfg

@@ -0,0 +1,3 @@
+[metadata]
+description-file = README.md
+license_file = LICENSE

src/widget.tsx

@@ -25,7 +25,7 @@ import '../css/widget.css'
 import * as React from "react";
 import * as ReactDOM from "react-dom";
 import _ from 'lodash';
-import {Tabs,Tab, Alert} from 'react-bootstrap';
+import {Tabs,Tab} from 'react-bootstrap';
 import ChartGalleryComponent from './chartGallery';
 import CurrentVisComponent from './currentVis';
 import {dispatchLogEvent} from './utils';