Create PUBLISH.md

PUBLISH.md

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+Steps to publish a new clippy version
+
+1. `cargo test`.
+- Bump `package.version` in `./Cargo.toml` (no need to manually bump `dependencies.clippy_lints.version`).
+- Run `./util/update_lints.py`.
+- Write a changelog entry.
+- Commit `./Cargo.toml`, `./clippy_lints/Cargo.toml` and `./CHANGELOG.md`.
+- `git push`
+- Wait for Travis's approval.
+- Merge.
+- `cargo publish` in `./clippy_clints`.
+- `cargo publish` in the root directory.
+- `git pull`.
+- `git tag -s v0.0.X`.
+- `git push --tags`.