Travis CI: fix by installing pip compatible with python 3.6 (#3041)

Pip install script no longer supports python3.6 by default, switched to a script that does.

diff --git a/.travis.yml b/.travis.yml
index 6a1295b4cee326cd7d1c09c3b194d155e67dd52d..c49f3ee3d6fcaabba2332885a9b6acc5136f71e5 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -102,7 +102,7 @@ matrix:
           travis_retry curl -o ~/ninja.zip -L 'https://github.com/ninja-build/ninja/releases/download/v1.9.0/ninja-linux.zip' &&
           unzip ~/ninja.zip -d ~/.local/bin
         - |
-          travis_retry curl -o ~/get-pip.py -L 'https://bootstrap.pypa.io/get-pip.py' &&
+          travis_retry curl -o ~/get-pip.py -L 'https://bootstrap.pypa.io/pip/3.6/get-pip.py' &&
           python3 ~/get-pip.py --user &&
           pip3 install --user meson
       script: