Auto merge of #3795 - jryans:template-year, r=alexcrichton

Add year to project template variables

This adds the current year as a `year` variable for project templates. Some license files / headers include the year, so this should make it easier to include those in a template.

diff --cc Cargo.lock
Simple merge

diff --cc Cargo.toml
Simple merge

diff --cc src/cargo/ops/cargo_new.rs
Simple merge

diff --cc tests/new.rs
Simple merge