Update arrow from 0.13.2 to 0.14.1

pyup-bot · pyup-bot · commit 4e8c9fc7134f · 2019-06-04T01:15:56.000+10:00
diff --git a/requirements-optional.txt b/requirements-optional.txt
@@ -4,4 +4,4 @@ msgpack==0.6.1
 ply==3.11
 humanfriendly==4.18
 pyyaml==5.1
-arrow==0.13.2
+arrow==0.14.1
