Enable RSpec/ScatteredSetup & fix issue

Read about cop at http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/ScatteredSetup

.rubocop.yml

@@ -168,3 +168,6 @@ RSpec/ReturnFromStub:
 
 RSpec/ScatteredLet:
   Enabled: true
+
+RSpec/ScatteredSetup:
+  Enabled: true

spec/models/abilities/valuator_spec.rb

@@ -10,8 +10,10 @@ describe Abilities::Valuator do
   let(:assigned_investment) { create(:budget_investment, budget: create(:budget, phase: 'valuating')) }
   let(:finished_assigned_investment) { create(:budget_investment, budget: create(:budget, phase: 'finished')) }
 
-  before { assigned_investment.valuators << valuator }
-  before { finished_assigned_investment.valuators << valuator }
+  before do
+    assigned_investment.valuators << valuator
+    finished_assigned_investment.valuators << valuator
+  end
 
   it { should be_able_to(:read, SpendingProposal) }
   it { should be_able_to(:update, SpendingProposal) }