Fixes #187 -- test and build wheels on py38 (#188)

* Fixes #187 -- test and build wheels on py38

* Remove 3.8 for now

* Tell tox to use isolated builds

.azure-pipelines/wheel-builder.yml

@@ -143,6 +143,14 @@ jobs:
                   containerImage: 'pyca/cryptography-runner-windows:py3-x86_64'
                   PYTHON_VERSION: '37'
                   WINDOWS_ARCH: 'x86_64'
+              Python38-x86:
+                  containerImage: 'pyca/cryptography-runner-windows:py3-x86'
+                  PYTHON_VERSION: '38'
+                  WINDOWS_ARCH: 'x86'
+              Python38-x86-64:
+                  containerImage: 'pyca/cryptography-runner-windows:py3-x86_64'
+                  PYTHON_VERSION: '38'
+                  WINDOWS_ARCH: 'x86_64'
       steps:
           - script: '"C:/Python%PYTHON_VERSION%/python.exe" -m pip install -U pip==10.0.1'
             displayName: Downgrade pip lol

.travis.yml

@@ -18,6 +18,10 @@ matrix:
       env: TOXENV=py37 CC=gcc
       dist: xenial
       sudo: true
+    - python: 3.8
+      env: TOXENV=py38 CC=gcc
+      dist: xenial
+      sudo: true
     - python: pypy
       env: TOXENV=pypy CC=gcc
     - python: 2.7
@@ -32,6 +36,10 @@ matrix:
       env: TOXENV=py37 CC=clang
       dist: xenial
       sudo: true
+    - python: 3.8
+      env: TOXENV=py38 CC=clang
+      dist: xenial
+      sudo: true
     - python: pypy
       env: TOXENV=pypy CC=clang
     - python: 2.7

azure-pipelines.yml

@@ -84,6 +84,14 @@ jobs:
         TOXENV: py37
         containerImage: 'pyca/cryptography-runner-windows:py3-x86_64'
         PYTHON_DIR: 'Python37'
+      Python38-x86:
+        TOXENV: py38
+        containerImage: 'pyca/cryptography-runner-windows:py3-x86'
+        PYTHON_DIR: 'Python38'
+      Python38-x86-64:
+        TOXENV: py38
+        containerImage: 'pyca/cryptography-runner-windows:py3-x86_64'
+        PYTHON_DIR: 'Python38'
   steps:
   - script: "C:/%PYTHON_DIR%/Scripts/tox"
     displayName: 'Run tests'

setup.py

@@ -233,6 +233,7 @@ setup(
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
     ],
 
     ext_package="bcrypt",

tox.ini

@@ -1,5 +1,6 @@
 [tox]
-envlist = py27,pypy,py34,py35,py36,py37,pep8,py3pep8,packaging
+envlist = py27,pypy,py34,py35,py36,py37,py38,pep8,py3pep8,packaging
+isolated_build = True
 
 [testenv]
 extras =