Update README.md

README.md

-![Milvuslogo](https://github.com/milvus-io/docs/blob/master/v0.9.1/assets/milvus_logo.png)
+![Milvuslogo](https://github.com/milvus-io/docs/blob/master/v0.9.1/assets/milvus_logo.png?raw=true)
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 The following is Milvus architecture:
 
-![arch](https://github.com/milvus-io/docs/blob/master/v0.9.1/assets/milvus_arch.png)
+![arch](https://github.com/milvus-io/docs/blob/master/v0.9.1/assets/milvus_arch.png?raw=true)
 For more detailed introduction of Milvus and its architecture, see [Milvus overview](https://www.milvus.io/docs/overview.md). See Milvus [release notes](https://www.milvus.io/docs/release_notes.md) to keep up-to-date with its releases and updates.
 
 Milvus is an [LF AI Foundation](https://lfai.foundation/) incubation project.