update travis

Aldemuro · Aldemuro · commit 216d7d372fa2 · 2020-03-30T18:20:35.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,8 @@ python:
 virtualenv:
   system_site_packages: true
 
+install:
+  - pip install --upgrade pip==9.0.1
 jobs:
   include:
     - stage: check_release_steps
