fix readme typo

readme.md

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 <img src="./docs/onnx_modifier_logo_1.png" style="zoom: 60%;" />
 
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 English | [简体中文](readme_zh-CN.md)
 
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 # Introduction
 
 To edit an ONNX model, One common way is to visualize the model graph, and edit it using ONNX Python API. This works fine. However, we have to code to edit, then visualize to check. The two processes may iterate for many times, which is time-consuming. :wave: 

readme_zh-CN.md

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----
-title: onnx-modifier-ONNX可视化编辑
-author: Zhang Ge
-date: 2022-04-29 09:09:00 +0800
-categories: [专业积累, 工具开发]
-tags: [onnx]
-math: true
----
+<img src="./docs/onnx_modifier_logo_1.png" style="zoom: 60%;" />
 
 简体中文 | [English](readme.md)
 
-<img src="./docs/onnx_modifier_logo_1.png" style="zoom: 60%;" />
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 `ONNX `(Open Neural Network Exchange) 是一种针对机器学习所设计的开放式的文件格式，经常作为不同框架模型转化的中间文件。有时我们拿到ONNX文件，想将它进行一些修改，比如：
 
 - **删除部分节点。** 比如，`ONNX`文件中一些前后处理的算子节点。