chore: update README example

README.md

@@ -1,15 +1,15 @@
 # Leaseweb Go SDK
 Leaseweb Go SDK provides a golang client for Leaseweb's REST API.
 
-### Installation
+## Installation
 ```bash
-go get github.com/LeaseWeb/leaseweb-go-sdk/v2
+go get github.com/LeaseWeb/leaseweb-go-sdk/v3
 ```
 
-### Generate your API Key
+## Generate your API Key
 You can generate your API key at the [Customer Portal](https://secure.leaseweb.com/).
 
-### Example
+## Example
 ```golang
 package main
 
@@ -18,7 +18,7 @@ import (
 	"fmt"
 	"os"
 
-	openapiclient "github.com/leaseweb/leaseweb-go-sdk/v2/publiccloud"
+	openapiclient "github.com/leaseweb/leaseweb-go-sdk/v3/publiccloud"
 )
 
 func main() {
@@ -58,10 +58,10 @@ The Leaseweb Go SDK documentation based on product:
 - [Invoice](invoice/README.md)
 - [DNS](dns/README.md)
 
-### Issues
+## Issues
 If you encounter an issue with the project, you are welcome to submit an [issue](https://github.com/Leaseweb/leaseweb-go-sdk/issues).
 
-### Pull requests
+## Pull requests
 We ask that an issue is always opened prior to a PR to give us the opportunity to discuss the best place for the change before investing your effort on a patch that we may not be able to accept.
 
 The code in the repository is generated from the OpenAPI specification. This means PRs to code, tests and sometimes even markdown are often inappropriate, and we may need to make changes to the specification instead.