Update psutil from 5.2.2 to 5.4.0

requirements.txt

@@ -4,7 +4,7 @@ cocos2d==0.6.5
 coverage==4.4.2
 execnet==1.5.0
 packaging==16.8
-psutil==5.2.2
+psutil==5.4.0
 py==1.4.31
 pyglet==1.2.4
 pymlconf==0.7.0