travis: enable 3.9 and make it fatal

sebastinas · sebastinas · commit 6f810abf519f · 2020-10-11T13:52:49.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,7 +8,7 @@ python:
     - "3.6"
     - "3.7"
     - "3.8"
-    - "3.9-dev"
+    - "3.9"
     - "pypy"
     - "pypy3"
 
@@ -18,7 +18,6 @@ env:
 
 matrix:
     allow_failures:
-        - python: "3.9-dev"
         - python: "pypy"
         - python: "pypy3"
 
