Simplify travis.yml a bit
Because our build matrix has only one case we can remove the build matrix and
the environment variables.
language: python
+os: linux
-matrix:
- include:
- - os: linux
- env:
- - LUA="lua=5.3"
cache:
directories:
- hrenv
before_install:
- pip install hererocks
- - hererocks hrenv -rlatest --$LUA
+ - hererocks hrenv --luarocks=latest --lua=5.3
- source hrenv/bin/activate
install:
