Added test for string type release

Author: ahmedetefy

packages/hub/test/session.test.ts

@@ -10,4 +10,10 @@ describe('Session', () => {
       expect.objectContaining({ attrs: { release: JSON.stringify({ name: 'whatever' }) } }),
     );
   });
+  test('Release of type string is not stringified in toJSON()', () => {
+    const session = new Session({
+      release: '1.0.x',
+    });
+    expect(session.toJSON()).toEqual(expect.objectContaining({ attrs: { release: '1.0.x' } }));
+  });
 });