Add support for Python 3.8

I'm skipping the MacOS build on Travis because 3.8 is not available yet
from https://github.com/MacPython/terryfy

.manylinux-install.sh

@@ -7,7 +7,8 @@ for PYBIN in /opt/python/*/bin; do
     if [[ "${PYBIN}" == *"cp27"* ]] || \
        [[ "${PYBIN}" == *"cp35"* ]] || \
        [[ "${PYBIN}" == *"cp36"* ]] || \
-       [[ "${PYBIN}" == *"cp37"* ]]; then
+       [[ "${PYBIN}" == *"cp37"* ]] || \
+       [[ "${PYBIN}" == *"cp38"* ]]; then
         "${PYBIN}/pip" install -e /io/
         "${PYBIN}/pip" wheel /io/ -w wheelhouse/
 	rm -rf /io/build /io/*.egg-info

.travis.yml

@@ -19,6 +19,8 @@ matrix:
             - WITH_COVERAGE=1
         - os: linux
           python: 3.7
+        - os: linux
+          python: 3.8
         - os: linux
           python: pypy
         - os: linux

CHANGES.rst

@@ -4,7 +4,7 @@
 4.6.1 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Add support for Python 3.8.
 
 
 4.6.0 (2019-07-30)

appveyor.yml

@@ -13,6 +13,8 @@ environment:
     - python: 36-x64
     - python: 37
     - python: 37-x64
+    - python: 38
+    - python: 38-x64
 
 install:
   - "SET PATH=C:\\Python%PYTHON%;c:\\Python%PYTHON%\\scripts;%PATH%"

setup.py

@@ -159,6 +159,7 @@ setup(name='BTrees',
           "Programming Language :: Python :: 3.5",
           "Programming Language :: Python :: 3.6",
           "Programming Language :: Python :: 3.7",
+          "Programming Language :: Python :: 3.8",
           "Programming Language :: Python :: Implementation :: CPython",
           "Programming Language :: Python :: Implementation :: PyPy",
           "Framework :: ZODB",

tox.ini

@@ -3,7 +3,7 @@ envlist =
 # Jython support pending 2.7 support, due 2012-07-15 or so.  See:
 # http://fwierzbicki.blogspot.com/2012/03/adconion-to-fund-jython-27.html
 #   py27,jython,pypy,coverage,docs
-    py27,py27-pure,py35,py35-pure,py36,py37,pypy,pypy3,w_zodb,coverage,docs
+    py27,py27-pure,py35,py35-pure,py36,py37,py38,pypy,pypy3,w_zodb,coverage,docs
 
 [testenv]
 usedevelop = true