Add old release checklist

doc/release-checklist.md

@@ -0,0 +1,27 @@
+Release checklist:
+
+- [ ] Check for outdated dependencies (`cargo outdated`)
+- [ ] Optional: update dependencies with `cargo update`.
+      See also https://deps.rs/repo/github/sharkdp/bat
+- [ ] Update syntaxes and themes (`cargo install -f --path .; assets/create.sh`).
+- [ ] Update README (features, usage, languages, ..).
+- [ ] Update man page
+
+
+- [ ] Update version in `Cargo.toml`. Run `cargo build` to update `Cargo.lock`
+- [ ] Update version in README and possibly update minimum Rust version
+- [ ] Run `cargo fmt`
+- [ ] Run `cargo test`
+- [ ] Run `cargo install --path . -f`
+- [ ] Test new features & command-line options
+- [ ] Check `-h` and `--help` texts
+
+
+- [ ] `cargo publish --dry-run --allow-dirty`.
+- [ ] write GitHub release notes
+- [ ] check if CI succeeds
+- [ ] `git tag vX.Y.Z; git push --tags`
+- [ ] check binaries (that were uploaded via Travis/AppVeyor)
+- [ ] publish to crates.io by cloning a fresh repo and calling `cargo publish`.
+- [ ] Inform package maintainers about the update:
+    - https://www.archlinux.org/packages/community/x86_64/bat/