Remove sudo from travis configuration (#225)

sbc100 · web-flow · commit cd59b3aa26e5 · 2019-02-27T10:50:07.000-08:00
In theory this should speed it up a little.  I suppose it was
initially added because we use docker but it doesn't seem that is
requirement here.
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,3 @@
-sudo: required
-
 language: python
 
 services:
