This patch changes the HabitInstance implementation so that the comment
is not expected to exist in the instance object itself.
This is done for less data duplication.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
With this patch we move the codebase to Rust-2018.
The diff was generated by executing
cargo fix --all --all-features --edition
on the codebase.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>