Wrap long line in Guardfile (style).
Update RuboCop disable rule name in testing code (style).
Update Regexp literal syntax in Guardfile to prefer %r{...} (style).
Prefer `map(&:method)` form to simple blocks (style).

However, this may lead to slightly more dense and hard-to-parse code if
over used. Proceed with caution.
Prefer double-quoted strings in Gemfile & Guardfile (style).
Prefer hash rocket style in Gemfile (style).
Refactor & normalize Guardfile format.
Add source encoding comments to Gemfile & Guardfile.
Disable RuboCop AbcSize metric in ssh_base_spec method.
Add empty line in env.rb (style).