esr_crate: Fix getting license info
esr_crate: Fix getting license info

 `license` was available as a crate-level property. But not anymore.
 So we get the license of max_version instead.

Signed-off-by: Mohammad AlSaleh <6c225a8dcf0f3ea8ab31a8a88dea0c937d544fc7@gmail.com>

rust-alt/cargo-esr