Merge pull request #1584 from lance5890/improve_readme

docs: correct the ProtocolDriver links in README

README.md

@@ -8,7 +8,7 @@ This repository is a set of Go packages that can be used to build Go-based [devi
 
 ## Usage
 
-Developers can make their own device service by implementing the [`ProtocolDriver`](https://github.com/edgexfoundry/device-sdk-go/blob/main/pkg/models/protocoldriver.go) interface for their desired IoT protocol, and the `main` function to start the Device Service. To implement the `main` function, the [`startup`](https://github.com/edgexfoundry/device-sdk-go/tree/main/pkg/startup) package can be optionally leveraged, or developers can write customized bootstrap code by themselves.
+Developers can make their own device service by implementing the [`ProtocolDriver`](https://github.com/edgexfoundry/device-sdk-go/blob/main/pkg/interfaces/protocoldriver.go) interface for their desired IoT protocol, and the `main` function to start the Device Service. To implement the `main` function, the [`startup`](https://github.com/edgexfoundry/device-sdk-go/tree/main/pkg/startup) package can be optionally leveraged, or developers can write customized bootstrap code by themselves.
 
 Please see the provided [simple device service](https://github.com/edgexfoundry/device-sdk-go/tree/main/example) as an example, included in this repository.