Travis: Use Python 3.8 alias instead of specific version

Otherwise it breaks when they update the container to a new version, like they did today with 3.7.6.
2020-02-25 10:30:51 +01:00 · 2020-02-25 10:30:51 +01:00 · c418966623
parent 2ca5f22bce
commit c418966623
1 changed files with 1 additions and 1 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -125,7 +125,7 @@ before_install:

 install:
  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-      pyenv global 3.7.5 system;
+      pyenv global 3.8 system;
      pip3 install --user scons;
    fi
  - scons --version