Add support for Python 3.8

Author: Harmon758

.travis.yml

@@ -4,6 +4,7 @@ python:
   - "3.5"
   - "3.6"
   - "3.7"
+  - "3.8"
   - "nightly"
   # - "pypy" - won't work as smmap doesn't work (see gitdb/.travis.yml for details)
 matrix:

README.md

@@ -19,7 +19,7 @@ If it is not in your `PATH`, you can help GitPython find it by setting
 the `GIT_PYTHON_GIT_EXECUTABLE=<path/to/git>` environment variable.
 
 * Git (1.7.x or newer)
-* Python 3.4 to 3.7.
+* Python >= 3.4
 
 The list of dependencies are listed in `./requirements.txt` and `./test-requirements.txt`.
 The installer takes care of installing them for you.

setup.py

@@ -105,6 +105,7 @@ def _stamp_version(filename):
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7"
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8"
     ]
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34,py35,py36,py37,flake8
+envlist = py34,py35,py36,py37,py38,flake8
 
 [testenv]
 commands = nosetests {posargs}