Make Travis happy on macOS and upgrade Linux builds to trusty

Kwpolska · Kwpolska · commit 9e906f597bea · 2018-03-17T17:50:12.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ language: python
 cache:
 - apt
 - pip
+dist: trusty
 sudo: false
 addons:
   apt:
@@ -23,7 +24,8 @@ matrix:
     env: NMODE=nikola OS=macOS
     python: '3.6'
     before_install:
-    - brew install python3
+    - brew update
+    - brew upgrade python
     - pip3 install virtualenv
     - python3 -m virtualenv nikola-tests-venv
     - source nikola-tests-venv/bin/activate
