switch to container-based travis build

Author: tarruda

.travis.yml

@@ -1,3 +1,4 @@
+sudo: false
 language: python
 env:
   global:
@@ -24,8 +25,6 @@ python:
   - pypy
 before_install:
   - if [ $CI_TARGET = tests ]; then
-      sudo apt-get update -qq;
-      sudo apt-get install expect -q;
       eval "$(curl -Ss https://raw.githubusercontent.com/neovim/bot-ci/master/scripts/travis-setup.sh) nightly-x64";
       pip install -q scrutinizer-ocular;
     else
@@ -35,7 +34,6 @@ install:
   - pip install .
 script:
   - if [ $CI_TARGET = tests ]; then
-      ./scripts/run-api-tests.exp "nosetests" "nvim -u NONE";
       NVIM_CHILD_ARGV='["nvim", "-u", "NONE", "--embed"]' nosetests;
     else
       flake8 neovim;