Fix readme for more recent Electron versions (#169)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

@@ -30,11 +30,7 @@ let mainWindow;
 (async () => {
 	await app.whenReady();
 
-	mainWindow = new BrowserWindow({
-		webPreferences: {
-			spellcheck: true
-		}
-	});
+	mainWindow = new BrowserWindow();
 })();
 ```
 
@@ -66,11 +62,7 @@ let mainWindow;
 (async () => {
 	await app.whenReady();
 
-	mainWindow = new BrowserWindow({
-		webPreferences: {
-			spellcheck: true
-		}
-	});
+	mainWindow = new BrowserWindow();
 })();
 ```
 
@@ -127,7 +119,7 @@ Default: `true`
 
 Show the `Learn Spelling {selection}` menu item when right-clicking text.
 
-Even if `true`, the `spellcheck` preference in browser window must still be enabled. It will also only show when right-clicking misspelled words.
+The spellcheck will only show when right-clicking misspelled words.
 
 #### showLookUpSelection
 
@@ -279,7 +271,7 @@ Even though you include an action, it will still only be shown/enabled when appr
 
 `MenuItem` labels may contain the placeholder `{selection}` which will be replaced by the currently selected text as described in [`options.labels`](#labels).
 
-To get spellchecking, “Correct Automatically”, and “Learn Spelling” in the menu, please enable the `spellcheck` preference in browser window: `new BrowserWindow({webPreferences: {spellcheck: true}})`
+To get spellchecking, “Correct Automatically”, and “Learn Spelling” in the menu, make sure you have not disabled the `spellcheck` option (it's `true` by default) in `BrowserWindow`.
 
 The following options are ignored when `menu` is used: