minor #920 fix typo (michielkempen)

This PR was merged into the 3.0.x-dev branch.

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d6f66f9 fix typo

Author: acrobat

README.md

@@ -42,7 +42,7 @@ composer require knplabs/github-api:^3.0 guzzlehttp/guzzle:^7.0.1 http-interop/h
 ### Laravel 6+:
 
 ```bash
-composer require graham-campbell/github^10.0 guzzlehttp/guzzle:^7.0.1 http-interop/http-factory-guzzle:^1.0
+composer require graham-campbell/github:^10.0 guzzlehttp/guzzle:^7.0.1 http-interop/http-factory-guzzle:^1.0
 ```
 
 We are decoupled from any HTTP messaging client with help by [HTTPlug](http://httplug.io). Read about clients in our [docs](doc/customize.md). [graham-campbell/github](https://github.com/GrahamCampbell/Laravel-GitHub) is by [Graham Campbell](https://github.com/GrahamCampbell).