Fix rubocop offenses

spec/lib/gitlab/ci/build/image_spec.rb

@@ -49,4 +49,4 @@ describe Gitlab::Ci::Build::Image do
       it { is_expected.to be_empty }
     end
   end
-end
\ No newline at end of file
+end

spec/lib/gitlab/ci/build/step_spec.rb

@@ -30,4 +30,4 @@ describe Gitlab::Ci::Build::Step do
       it { expect(subject.allow_failure).to be_truthy }
     end
   end
-end
\ No newline at end of file
+end

spec/requests/api/runner_spec.rb

@@ -288,7 +288,7 @@ describe API::Runner do
               'ref' => job.ref,
               'sha' => job.sha,
               'before_sha' => job.before_sha,
-              'ref_type' => 'branch'}
+              'ref_type' => 'branch' }
           end
           let(:expected_steps) do
             [{ 'name' => 'script',