Set prod env when analyzing bundle

Author: coryhouse

tools/analyzeBundle.js

@@ -4,6 +4,8 @@ import config from '../webpack.config.prod';
 
 config.plugins.push(new BundleAnalyzerPlugin());
 
+process.env.NODE_ENV = 'production';
+
 const compiler = webpack(config);
 
 compiler.run((error, stats) => {