Update mysqlclient from 1.3.11 to 1.3.12

requirements/prod.txt

@@ -12,8 +12,8 @@ Jinja2==2.9.6 \
 # MarkupSafe is required by Jinja2
 MarkupSafe==1.0 \
     --hash=sha256:a6be69091dac236ea9c6bc7d012beab42010fa914c459791d627dad4910eb665
-mysqlclient==1.3.11 \
-    --hash=sha256:9a79b38843d61f651266ff16b9fdcc8830d21f0fb852e4406a19e9a715bdf3e2
+mysqlclient==1.3.12 \
+    --hash=sha256:2d9ec33de39f4d9c64ad7322ede0521d85829ce36a76f9dd3d6ab76a9c8648e5
 Pillow==4.2.1 \
     --hash=sha256:c7ba8b42923c1b5e72fe3b0aa792de8ffc13c5a3d4df8e88f06959d0835fea8e \
     --hash=sha256:e07f388cf345b002853eabb720c234b281119cf4c2677d7e0b9ec4d8f9a18fbd \