Merge pull request AuthorizeNet#147 from AuthorizeNet/mandate

Changes for March 2021

Author: gnongsie

Diff for: .travis.yml

@@ -11,16 +11,18 @@ python:
   - "3.4"
   - "3.5"
   - "3.6"
-  - "3.7-dev"
   - "pypy"
   - "pypy3"
 
 matrix:
   fast_finish: true
   allow_failures:
-    - python: "3.7-dev"
-      # 3.7-dev started crashing when building lxml although the neither the python version nor the lxml version seemed to change.
-      # Will have to investigate further.
+    - python: 3.7
+      dist: xenial
+      sudo: true
+    - python: 3.8
+      dist: xenial
+      sudo: true
     - python: "pypy"
     - python: "pypy3"
     - python: "3.4"