update readme

Author: juzisang

README.md

@@ -42,7 +42,7 @@ key 可选
 ## 压缩效果对比
 
 | 类型   | tinypng                                                                                        | imagemin                                                                                        | image2webp                                                                                            |
-| ------ | ---------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------- | ------ |
-| 原大小 | 1.5 MB                                                                                         | 1.5 MB                                                                                          | 1.5 MB                                                                                                | 1.5 MB |
-| 压缩后 | 315 KB                                                                                         | 276 KB                                                                                          | 411 KB                                                                                                | 216 KB |
+| ------ | ---------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------- |
+| 原大小 | 1.5 MB                                                                                         | 1.5 MB                                                                                          | 1.5 MB                                                                                                |
+| 压缩后 | 315 KB                                                                                         | 411 KB                                                                                          | 216 KB                                                                                                |
 | 效果图 | ![](https://raw.githubusercontent.com/JuZiSang/picgo-plugin-compress/master/tests/tinypng.png) | ![](https://raw.githubusercontent.com/JuZiSang/picgo-plugin-compress/master/tests/imagemin.png) | ![](https://raw.githubusercontent.com/JuZiSang/picgo-plugin-compress/master/tests/imagemin_webp.webp) |