Update README.md

readme: smaller indents

Author: medvednikov

README.md

@@ -16,44 +16,44 @@ import ui
 
 struct App {
 mut:
-	window     &ui.Window = unsafe { nil }
-	first_name string
-	last_name  string
+    window     &ui.Window = unsafe { nil }
+    first_name string
+    last_name  string
 }
 
 fn main() {
-	mut app := &App{}
-	app.window = ui.window(
-		width: 600
-		height: 400
-		title: 'V UI Demo'
-		children: [
-			ui.row(
-				margin: ui.Margin{10, 10, 10, 10}
-				children: [
-					ui.column(
-						width: 200
-						spacing: 13
-						children: [
-							ui.textbox(
-								max_len: 20
-								width: 200
-								placeholder: 'First name'
-								text: &app.first_name
-							),
-							ui.textbox(
-								max_len: 50
-								width: 200
-								placeholder: 'Last name'
-								text: &app.last_name
-							),
-						]
-					),
-				]
-			),
-		]
-	)
-	ui.run(app.window)
+    mut app := &App{}
+    app.window = ui.window(
+        width: 600
+        height: 400
+        title: 'V UI Demo'
+        children: [
+            ui.row(
+                margin: ui.Margin{10, 10, 10, 10}
+                children: [
+                    ui.column(
+                        width: 200
+                        spacing: 13
+                        children: [
+                            ui.textbox(
+                                max_len: 20
+                                width: 200
+                                placeholder: 'First name'
+                                text: &app.first_name
+                            ),
+                            ui.textbox(
+                                max_len: 50
+                                width: 200
+                                placeholder: 'Last name'
+                                text: &app.last_name
+                            ),
+                        ]
+                    ),
+                ]
+            ),
+        ]
+    )
+    ui.run(app.window)
 }
 ````