Update README.md

Author: meili-bot

README.md

@@ -53,7 +53,7 @@ To use `meilisearch-sdk`, add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-meilisearch-sdk = "0.27.1"
+meilisearch-sdk = "0.28"
 ```
 
 The following optional dependencies may also be useful: