Convert specs to RSpec 3.3.2 syntax with Transpec

[sbadia]

• 15 conversions from: == expected to: eq(expected)
• 12 conversions from: it { should ... } to: it { is_expected.to ... }
• 12 conversions from: its(:attr) { } to: describe '#attr' do subject { super().attr }; it { } end
• 3 conversions from: obj.should to: expect(obj).to