Add more notes about transferring ownership during release (#914)

Try to avoid delayed releases by mentioning it several times, haha

make_release/Readme.md

@@ -56,9 +56,11 @@
 ## 3. Publish `nu` to *crates.io*
 - [ ] check the order of dependencies with `nushell/nu_scripts/make_release/nu_deps.nu` from the `nushell` repo
 - [ ] release the Nushell crates `nushell/nu_scripts/make_release/nu_release.nu` from the `nushell` repo
+- [ ] **Important!** add any new crates to the `github:nushell:publishing` group on crates.io: `cargo owner --add github:nushell:publishing -p <crate>`
 
 > **Note**
 > if there is a new crate, you must add it to the `github:nushell:publishing` group (`cargo owner --list`)
+> this will make things very difficult for us next time if you don't, as we won't be able to release new versions of any dependent crates either
 
 > **Note**
 > if a step fails