Monitor should close what it inherits (#1076)

Author: harry-uglow

baselines/bench/monitor.py

@@ -77,6 +77,7 @@ def update(self, ob, rew, done, info):
         self.total_steps += 1
 
     def close(self):
+        super(Monitor, self).close()
         if self.f is not None:
             self.f.close()