Fix the stub to return in the expected format (#93)

Author: necojackarc

test/reviewer.test.js

@@ -147,20 +147,7 @@ describe('reviewer', function() {
     };
 
     const stub = sinon.stub(github, 'get_team_members');
-    stub.withArgs('koopa-troop').returns([
-      {
-        login: 'bowser',
-        id: 1,
-      },
-      {
-        login: 'king-boo',
-        id: 2,
-      },
-      {
-        login: 'goomboss',
-        id: 3,
-      },
-    ]);
+    stub.withArgs('koopa-troop').returns([ 'bowser', 'king-boo', 'goomboss' ]);
 
     it('returns nothing when config does not have a "per-author" key', function() {
       const author = 'THIS DOES NOT MATTER';