* Update readme.md
In version 2.6.5, this commit https://github.com/barryvdh/laravel-ide-helper/commit/f8a8cb18e0a42ae4131b7ed865fe792f9b34630c made it so library's consumer no longer need to pull in `doctrine/dbal` manually. I think we should mention that in the readme file as well. Although I'm not sure if it adds any value to the file itself or not.
* Remove note about doctrine/dbal from readme.md
