Update requests from 2.19.0 to 2.19.1

requirements/docs.txt

@@ -36,9 +36,9 @@ pytz==2018.4 \
     --hash=sha256:65ae0c8101309c45772196b21b74c46b2e5d11b6275c45d251b150d5da334555 \
     --hash=sha256:c06425302f2cf668f1bba7a0a03f3c1d34d4ebeef2c72003da308b3947c7f749
 # requests is required by Sphinx
-requests==2.19.0 \
-    --hash=sha256:421cfc8d9dde7d6aff68196420afd86b88c65d77d8da9cf83f4ecad785d7b9d6 \
-    --hash=sha256:cc408268d0e21589bcc2b2c248e42932b8c4d112f499c12c92e99e2178a6134c
+requests==2.19.1 \
+    --hash=sha256:63b52e3c866428a224f97cab011de738c36aec0185aa91cfacd418b5d58911d1 \
+    --hash=sha256:ec22d826a36ed72a7358ff3fe56cbd4ba69dd7a6718ffd450ff0e9df7a47ce6a
 sphinxcontrib-httpdomain==1.6.1 \
     --hash=sha256:2572c10bf84fab856999667369e3604eb209d8dda7321556bfee93fddcfc33b5 \
     --hash=sha256:029f596deb7b4246148a8e8a7d041764d0cad545cf4f3bb6252ac90c785ab221