docs: update example

Author: tannerlinsley

examples/line/src/index.js

@@ -1,6 +1,6 @@
 import React from "react";
 import ReactDOM from "react-dom";
-import { timeDay } from "d3";
+// import { timeDay } from "d3";
 
 import { Chart } from "react-charts";
 
@@ -29,8 +29,8 @@ export default function App() {
         primary: true,
         type: "time",
         position: "bottom",
-        filterTicks: (ticks) =>
-          ticks.filter((date) => +timeDay.floor(date) === +date),
+        // filterTicks: (ticks) =>
+        //   ticks.filter((date) => +timeDay.floor(date) === +date),
       },
       { type: "linear", position: "left" },
     ],