Readme update

README.md

@@ -1,10 +1,8 @@
 # Modern Spreadsheet
-
 - High performance spreadsheet based on CanvasAPI.
 - TypeScript supported
 
 ## Basic usage
-
 ```ts
 import Spreadsheet from "modern_spreadsheet";
 import "modern_spreadsheet/style.css"; // <= this is required
@@ -15,25 +13,23 @@ const sheet = new Spreadsheet(target);
 ```
 
 ## Save and load data
-
 ```ts
 function saveData() {
-  const serialized = sheet.serializeData();
-  localStorage.setItem("sheet_data", JSON.stringify(serialized));
+	const serialized = sheet.serializeData();
+	localStorage.setItem("sheet_data", JSON.stringify(serialized));
 }
 
 function loadData() {
-  const data = localStorage.getItem("sheet_data");
-  const json = JSON.parse(data);
-  if (!json) return;
-  sheet.loadData(json);
+	const data = localStorage.getItem("sheet_data");
+	const json = JSON.parse(data);
+	if (!json) return;
+	sheet.loadData(json);
 }
 ```
 
 ## Roadmap
-
+  - ~~Rows number and columns heading render~~
 - Custom event functions (ex.: onSelectionChange, onCellEdit...). Full list of supported events will available on this page
-- Rows number and columns heading render
 - Rows and columns resizing
 - Toolbar
 - Context menu
@@ -41,4 +37,3 @@ function loadData() {
 - Selected cell depends cells highlight
 - Async formulas support
 - Mutlisheets (?)
--