Update flower from 0.9.2 to 0.9.3

requirements/prod.txt

@@ -321,8 +321,8 @@ vine==1.1.4 \
 django-ses==0.8.7 \
     --hash=sha256:d16e0de48cd3369b45af9a292e8c31f0aa014149d0807eeb2edae795f99878f9 \
     --hash=sha256:e0a8b3c9c2123dfd04d29bb9e2423610f855e2607f53a4c2515ff94313de687f
-flower==0.9.2 \
-    --hash=sha256:a7a828c2dbea7e9cff1c86d63626f0eeb047b1b1e9a0ee5daad30771fb51e6d0
+flower==0.9.3 \
+    --hash=sha256:7f45acb297ab7cf3dd40140816143a2588f6938dbd70b8c46b59c7d8d1e93d55
 tornado==5.1.1 \
     --hash=sha256:732e836008c708de2e89a31cb2fa6c0e5a70cb60492bee6f1ea1047500feaf7f \
     --hash=sha256:0662d28b1ca9f67108c7e3b77afabfb9c7e87bde174fbda78186ecedc2499a9d \