Merge pull request #3185 from mozilla/pyup-update-sphinx-1.8.2-to-1.8.3

Update sphinx to 1.8.3

requirements/dev.txt

@@ -2,9 +2,9 @@
 
 -r prod.txt
 
-Sphinx==1.8.2 \
-    --hash=sha256:b348790776490894e0424101af9c8413f2a86831524bd55c5f379d3e3e12ca64 \
-    --hash=sha256:120732cbddb1b2364471c3d9f8bfd4b0c5b550862f99a65736c77f970b142aea
+Sphinx==1.8.3 \
+    --hash=sha256:429e3172466df289f0f742471d7e30ba3ee11f3b5aecd9a840480d03f14bcfe5 \
+    --hash=sha256:c4cb17ba44acffae3d3209646b6baec1e215cad3065e852c68cc569d4df1b9f8
 Werkzeug==0.14.1 \
     --hash=sha256:d5da73735293558eb1651ee2fddc4d0dedcfa06538b8813a2e20011583c9e49b \
     --hash=sha256:c3fd7a7d41976d9f44db327260e263132466836cef6f91512889ed60ad26557c