doc: add milvus to README usage (#845) (#847)

README.md

@@ -55,6 +55,7 @@ Here's how `revive` is different from `golint`:
 - [`Codeac.io`](https://www.codeac.io?ref=revive) - Automated code review service integrates with GitHub, Bitbucket and GitLab (even self-hosted) and helps you fight technical debt.
 - [`DevLake`](https:/apache/incubator-devlake) - Apache DevLake is an open-source dev data platform to ingest, analyze, and visualize the fragmented data from DevOps tools，which can distill insights to improve engineering productivity.
 - [`checker`](https:/cinar/checker) - Checker helps validating user input through rules defined in struct tags or directly through functions.
+- [`milvus`](https:/milvus-io/milvus) - A cloud-native vector database, storage for next generation AI applications.
 
 *Open a PR to add your project*.