Update README.md

Author: D1M1TR10S

README.md

@@ -2,7 +2,7 @@
 
 > SDK for building GitHub Copilot Extensions
 
-⚠️ **This SDK is a preview and subjetct to change**. We will however adhere to [semantic versioning](https://semver.org/), so it's save to use for early experimentation. Just beware there will be breaking changes. Best to watch this repository's releases for updates.
+⚠️ **This SDK is a preview and subject to change**. We will however adhere to [semantic versioning](https://semver.org/), so it's save to use for early experimentation. Just beware there will be breaking changes. Best to watch this repository's releases for updates.
 
 ## Usage