Promote python 3.8 in .travis.yml

Python 3.8.0 is released. Use 3.8 instead of 3.7 as primary python
platform.

Also drop `nightly' and `3.8-dev' from the matrix.

And reorder matrix so that most-recent python 3.x versions run first.

Signed-off-by: Peter Grayson <[email protected]>

Author: jpgrayson

.travis.yml

@@ -12,39 +12,34 @@ matrix:
   include:
     - python: '2.7'
       env: MAKE_TARGET=lint
-    - python: '3.7'
+    - python: '3.8'
       env: MAKE_TARGET=lint
       dist: xenial
     - python: '2.7'
       env: MAKE_TARGET=coverage-test
-    - python: '3.7'
+    - python: '3.8'
       env: MAKE_TARGET=coverage-test
       dist: xenial
     - python: 'pypy3'
       env: MAKE_TARGET=test
     - python: 'pypy'
       env: MAKE_TARGET=test
-    - python: '3.3'
-      dist: trusty
+    - python: '3.7'
       env: MAKE_TARGET=test
-    - python: '3.4'
+      dist: xenial
+    - python: '3.6'
       env: MAKE_TARGET=test
     - python: '3.5'
       env: MAKE_TARGET=test
-    - python: '3.6'
-      env: MAKE_TARGET=test
-    - python: '3.8-dev'
+    - python: '3.4'
       env: MAKE_TARGET=test
-      dist: xenial
-    - python: 'nightly'
-      dist: xenial
+    - python: '3.3'
+      dist: trusty
       env: MAKE_TARGET=test
     - python: '2.6'
       dist: trusty
       env: MAKE_TARGET=test
   allow_failures:
-    - python: '3.8-dev'
-    - python: 'nightly'
     - python: '2.6'
 
 install:

setup.py

@@ -162,6 +162,7 @@ def __check_git_version():
         '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',
         'Topic :: Software Development :: Version Control',