Change `be_success` to `be_successful` in specsfix-deprecation-warnings-change-success-to-successful

Fixes deprecation warning:

```
DEPRECATION WARNING: The success? predicate is deprecated and
will be removed in Rails 6.0.
Please use successful? as provided by Rack::Response::Helpers.
```

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/controllers/projects/commits_controller_spec.rb b/spec/controllers/projects/commits_controller_spec.rb
index 9db1ac2a46c..9c4d6fdcb2a 100644
--- a/spec/controllers/projects/commits_controller_spec.rb
+++ b/spec/controllers/projects/commits_controller_spec.rb
@@ -79,7 +79,7 @@ describe Projects::CommitsController do
           end
 
           it "renders as atom" do
-            expect(response).to be_success
+            expect(response).to be_successful
             expect(response.content_type).to eq('application/atom+xml')
           end
 
@@ -104,7 +104,7 @@ describe Projects::CommitsController do
           end
 
           it "renders as HTML" do
-            expect(response).to be_success
+            expect(response).to be_successful
             expect(response.content_type).to eq('text/html')
           end
         end