[Update] 升级gunicorn版本

requirements/requirements.txt

@@ -31,10 +31,10 @@ ecdsa==0.13
 elasticsearch==6.1.1
 enum-compat==0.0.2
 ephem==3.7.6.0
-eventlet==0.22.1
+eventlet==0.24.1
 ForgeryPy==0.1
-greenlet==0.4.12
-gunicorn==19.7.1
+greenlet==0.4.14
+gunicorn==19.9.0
 idna==2.6
 itsdangerous==0.24
 itypes==1.1.0