Reducing number of tests run

Author: Josh Clements

.travis.yml

@@ -3,17 +3,7 @@ language: python
 dist: xenial
 
 python:
- - "3.6"
- - "3.7"
  - "3.8"
- - "3.8-dev"
- - "nightly"
- - "pypy3"
-
-matrix:
-  allow_failures:
-  - python: 'pypy3'
-  - python: 'nightly'
 
 services:
  - redis-server