Fix CI

Author: njsmith

.travis.yml

@@ -1,24 +1,26 @@
 language: python
+dist: xenial
 python:
   # To see supported options, run:
   #   s3cmd ls s3://travis-python-archives/binaries/ubuntu/16.04/x86_64/
   # We put pypy first, b/c for tests they're the slowest
-  - pypy2.7-5.10.0
-  - pypy3.5-5.10.1
+  - pypy2.7-6.0
+  - pypy3.5-6.0
   - 2.7
   - 3.3  # probably irrelevant but so far supporting it has been free
   - 3.4
   - 3.5
   - 3.6
-  - 3.7-dev
-sudo: false
+  - 3.7
+  - 3.8-dev
 
 before_install:
-  - pip install -r test-requirements.txt
+  - pip install -U pip setuptools wheel
+  - pip install -Ur test-requirements.txt
   - pip install codecov
 
 script:
-  - py.test --cov=h11 --cov-config=.coveragerc h11
+  - pytest --cov=h11 --cov-config=.coveragerc h11
 
 after_success:
   - codecov