Backport build fixes.

.travis.yml

@@ -3,28 +3,9 @@ dist: xenial
 
 matrix:
  include:
- - python: 2.7
- env:
- - TOX_ENV=py26
  - python: 2.7
  env:
  - TOX_ENV=py27
- - python: 2.7
- env:
- - TOX_ENV=pypy2.7
- - python: 2.7
- env:
- - TOX_ENV=py27-numpy
- - python: 3.6
- env:
- - TOX_ENV=py32
- - python: 3.6
- env:
- - TOX_ENV=py33
- - python: 3.6
- dist: trusty
- env:
- - TOX_ENV=py34
  - python: 3.5
  env:
  - TOX_ENV=py35
@@ -41,20 +22,20 @@ matrix:
  sudo: yes
  env:
  - TOX_ENV=py37
- - python: 3.8-dev
+ - python: 3.8
  sudo: yes
  env:
  - TOX_ENV=py38
  - os: osx
  language: generic
- python: 3.6
+ python: 3.7
  env:
- - TOX_ENV=py36
+ - TOX_ENV=py37
  - os: windows
  language: sh
  python: 3.7
  before_install:
- - choco install python3
+ - choco install python --version=3.7.5
  - export PATH="/c/Python37:/c/Python37/Scripts:$PATH"
  - python -m pip install --upgrade pip wheel
  env:
@@ -67,7 +48,9 @@ before_install:
  - export EASY_SETUP_URL='http://peak.telecommunity.com/dist/ez_setup.py'
 
 install:
- - pip install --upgrade tox coveralls
+ - pip install --upgrade pip tox coveralls
+ - python --version
+ - pip --version
 
 script:
  - tox -e $TOX_ENV