Support Python 3.8 (#477)

* Support Python 3.8
* Add Python 3.8 trove classifier
* Add Python 3.8 support to README

.travis.yml

@@ -4,7 +4,7 @@ python:
   - '3.5'
   - '3.6'
   - '3.7'
-  - '3.8-dev'
+  - '3.8'
 
 dist: xenial
 
@@ -39,7 +39,6 @@ matrix:
   allow_failures:
     - env: TOXENV=lint
     - env: TOXENV=djmaster
-    - python: '3.8-dev'
 
   fast_finish: true
 

README.rst

@@ -15,7 +15,7 @@ Compatible with
 
 - **Django Rest Framework**: 3.8, 3.9, 3.10
 - **Django**: 1.11, 2.1, 2.2
-- **Python**: 2.7, 3.5, 3.6, 3.7
+- **Python**: 2.7, 3.5, 3.6, 3.7, 3.8
 
 Only the latest patch version of each ``major.minor`` series of Python, Django and Django REST Framework is supported.
 

setup.py

@@ -19,7 +19,7 @@ with io.open('README.rst', encoding='utf-8') as readme:
 requirements = read_req('base.txt')
 requirements_validation = read_req('validation.txt')
 
-py3_supported_range = (5, 7)
+py3_supported_range = (5, 8)
 
 # convert inclusive range to exclusive range
 py3_supported_range = (py3_supported_range[0], py3_supported_range[1] + 1)