message: Add Tokio 1.0 note to changelog
diff: +UNRELEASED
  +===================
  + * chore: upgrade `tokio` to `1.0`
  + * BREAKING: This requires the whole application to upgrade to `tokio` 1.0
  +
  0.45.0 / 2020-12-26
  ===================
  * feat: `kube-derive` now has a default enabled `schema` feature
  