Add missing relation between administrator and budget_administrators, otherwise
we'd get the following exception when deleting and administrator with assigned budgets:
PG::ForeignKeyViolation:
ERROR: update or delete on table "administrators" violates foreign key constraint "fk_rails_ee7dc33688" on table "budget_administrators"
DETAIL: Key (id)=(3) is still referenced from table "budget_administrators".
We're not adding the rule because it would apply the current line length
rule of 110 characters per line. We still haven't decided whether we'll
keep that rule or make lines shorter so they're easier to read,
particularly when vertically splitting the editor window.
So, for now, I'm applying the rule to lines which are about 90
characters long.
We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
