cargo-deb: README.md file exists, but is not specified in `readme` Cargo.toml field

The cargo reference states:

If no value is specified for this field, and a file named README.md, README.txt or README exists in the package root, then the name of that file will be used.

cargo-deb should not produce a warning for this and follow cargos behaviour of assuming one of these files. (Especially as the warning knows that the file exists)

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I am not a maintainer here although Im happy to help

@kornelski could you take a look at this issue? If the readme is required in some way to create a .deb package it should indeed throw an error if we are not certain of the readme file