Upload license file to crates.io

[mauricelam]

The license text LICENSE.md is not in the sources uploaded to crates.io.

$ wget https://crates.io/api/v1/crates/Inflector/0.11.4/download
$ tar -xvf download
$ ls Inflector-0.11.4
Cargo.toml  Cargo.toml.orig  README.md  src  tests

Can you please upload it to crates.io? It would make it easier for us to comply with the Redistributions of source code must retain the above copyright notice part, for automated tooling that downloads from crates.io to redistribute the notice more easily.