CI uses "whatever the stable rustfmt is" and you'll experience a lot of friction if you drift from that.
[] Remove -dev from the version in gotham/Cargo.toml
[] Remove -dev from the version in gotham_derive/Cargo.toml
[] Update the #![doc(html_root_url)] to point to the new version.
[] Make a commit of the release with a message like Releasing v0.x
[] Tag the commit as gotham_derive-0.x
[] Tag the commit as gotham-0.x
[] Create a branch for 0.x-maint
[] mv Cargo.toml Cargo.toml.suspend - the workspace has patches that interfere with releasing.
[] pushd gotham_derive; cargo publish; popd
[] pushd gotham; cargo publish; popd
[] Change the version in gotham/Cargo.toml to 0.<x+1>-dev
[] Change the version in gotham_derive/Cargo.toml to 0.<x+1>-dev
[] Commit with a message like Starting v0.<x+1>-dev
[] Push the commits and tags
[] Change to the maint branch and push that.
[] Start announcing the release.