Update the readme.

[Benjiko99]

Please add to the usage instructions in readme to set the position of the gameobject to (0.5, 0.5, 0) and scale to 1. I have just spend an hour trying to figure out why I can't see anything on the screen.

And add that a 32-bit unity editor is needed and can be downloaded from the dropdown menu on the download page http://i.imgur.com/Z62HjCC.png

Cheers.

[bkeiren]

Good points, thank you for your feedback and for checking out AwesomiumUnity!