Fix URL for deleting branches

lib/bitbucket_server/connection.rb

@@ -88,7 +88,7 @@ module BitbucketServer
 
     def delete_url(resource, path)
       if resource == :branches
-        "#{base_uri}/branch-utils/#{api_version}#{path}"
+        "#{base_uri}/rest/branch-utils/#{api_version}#{path}"
       else
         build_url(path)
       end

spec/lib/bitbucket_server/connection_spec.rb

@@ -39,7 +39,7 @@ describe BitbucketServer::Connection do
   describe '#delete' do
     context 'branch API' do
       let(:branch_path) { '/projects/foo/repos/bar/branches' }
-      let(:branch_url) { 'https://test:7990/branch-utils/1.0/projects/foo/repos/bar/branches' }
+      let(:branch_url) { 'https://test:7990/rest/branch-utils/1.0/projects/foo/repos/bar/branches' }
       let(:path) { }
 
       it 'returns JSON body' do