Constant project_init::includes::RUST_TRAVIS_CI

pub const RUST_TRAVIS_CI: &'static str = "language: rust\nsudo: false\n\ncache: cargo\n\nos:\n  - linux\n  - osx\n  - windows\n\nrust:\n  - nightly\n  - stable\n\nscript:\n  - cargo build\n  - cargo doc\n"