`LICENSE` should be in the package, but it shouldn't be in `main`.

From the [bower spec](https://docs.google.com/document/d/1APq7oA9tNao1UYWyOm8dKqlRP2blVkROYLZ2fLIjtWc/edit?pli=1):

> main [string|array of strings]

> The primary acting files necessary to use your package. 

`ignore` doesn't exclude `LICENSE`, so it will be in the package.