remove deprecated api from README

README.md

@@ -47,31 +47,21 @@ Example
 ![Result Image](images/simple1.png)
 
 ```rust
-let workbook = Workbook::new("target/simple1.xlsx")?;
-let format1 = workbook.add_format().set_font_color(FormatColor::Red);
-
-let format2 = workbook
-    .add_format()
-    .set_font_color(FormatColor::Blue)
-    .set_underline(FormatUnderline::Single);
-
-let format3 = workbook
-    .add_format()
-    .set_font_color(FormatColor::Green)
-    .set_align(FormatAlignment::CenterAcross)
-    .set_align(FormatAlignment::VerticalCenter);
+let workbook = Workbook::new("simple1.xlsx")?;
 
 let mut sheet1 = workbook.add_worksheet(None)?;
-sheet1.write_string(0, 0, "Red text", Some(&format1))?;
+sheet1.write_string(0, 0, "Red text", Some(&Format::new().set_font_color(FormatColor::Red)))?;
 sheet1.write_number(0, 1, 20., None)?;
 sheet1.write_formula_num(1, 0, "=10+B1", None, 30.)?;
 sheet1.write_url(
     1,
     1,
     "https://github.com/informationsea/xlsxwriter-rs",
-    Some(&format2),
+    Some(&Format::new().set_font_color(FormatColor::Blue).set_underline(FormatUnderline::Single)),
 )?;
-sheet1.merge_range(2, 0, 3, 2, "Hello, world", Some(&format3))?;
+sheet1.merge_range(2, 0, 3, 2, "Hello, world", Some(
+    &Format::new().set_font_color(FormatColor::Green).set_align(FormatAlignment::CenterAcross)
+                  .set_vertical_align(FormatVerticalAlignment::VerticalCenter)))?;
 
 sheet1.set_selection(1, 0, 1, 2);
 sheet1.set_tab_color(FormatColor::Cyan);