Pass children directly into the React components instead of using an …

…Array, which results in a "key missing" warning

lib/history-graph.js

@@ -26,12 +26,12 @@ function render (alert) {
   const maxTime = Math.max(...times);
   const maxPrice = Math.ceil(Math.max(...data.map(d => d.price)) / 50) * 50;
 
-  const Graph = e('div', null, [
+  const Graph = e('div', null,
     e(V.VictoryChart, {
       domainPadding: 20,
       padding: { top: 10, right: 50, bottom: 50, left: 50 },
       theme: Theme
-    }, [
+    },
       e(V.VictoryAxis, {
         domainPadding: 0,
         tickFormat: date => dateFormat(new Date(date), 'm/d', true)
@@ -65,8 +65,8 @@ function render (alert) {
         x: 0,
         y: 1
       })
-    ])
-  ]);
+    )
+  );
 
   return ReactDOMServer.renderToStaticMarkup(Graph);
 }