Travis CI now supports Python 3.9 (getsentry#894)

Author: cclauss

.travis.yml

@@ -16,7 +16,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
-  - "3.9-dev"
+  - "3.9"
 
 env:
   - SENTRY_PYTHON_TEST_POSTGRES_USER=postgres SENTRY_PYTHON_TEST_POSTGRES_NAME=travis_ci_test
@@ -31,21 +31,19 @@ branches:
     - /^release\/.+$/
 
 jobs:
-  allow_failures:
-    - python: "3.9-dev"
   include:
     - name: Linting
-      python: "3.8"
+      python: "3.9"
       install:
         - pip install tox
       script: tox -e linters
 
-    - python: "3.8"
+    - python: "3.9"
       name: Distribution packages
       install: []
       script: make travis-upload-dist
 
-    - python: "3.8"
+    - python: "3.9"
       name: Build documentation
       install: []
       script: make travis-upload-docs

tox.ini

@@ -277,7 +277,7 @@ basepython =
     # some random Python 3 binary, but then you get guaranteed mismatches with
     # CI. Other tools such as mypy and black have options that pin the Python
     # version.
-    linters: python3.8
+    linters: python3.9
     pypy: pypy
 
 commands =