language: python
python:
    - "2.7"
install:
    - pip install tox
    - nvm install 4.0 && nvm 4.0
    - npm install
script: 
    - make test

branches:
  only:
    - master

language: python
python:
    - "2.7"
install:
    - pip install tox
    - nvm install 4.0 && nvm use 4.0
    - npm install
script: 
    - make test

branches:
  only:
    - master

Fix nvm command in TravisCI build
Fix nvm command in TravisCI build

The `nvm 4.0` command returns an error code of 127 and halts the build.
See builds 312 and 313: https://travis-ci.org/vim-awesome/vim-awesome/builds
The command should be `nvm use 4.0`.

The breakage started after TravisCI switched from Precise to Trusty
images (this is visible in the build logs).
