update travis.yml to post-1.0

.travis.yml

-env:
-    global:
-        - secure: zpxgR0Nn7YhCRXPjfR/gcdxAObeJLBoRMW0qeKiyuc4V6Y1guZ9EfnvJ5uL4pRXnP0LZrXm/WwYicXm7J0vTwQwq/4Bf0NXykysZfVrHFTY5Wook/QXJd8OajCwuJa8d/wr6Dx/wGe/80gi8hZibraMS5QkWKgtzz9HCFLM99uw=
 language: rust
-before_install:
-  - sudo add-apt-repository ppa:team-xbmc/ppa -y
-  - sudo apt-get update -qq
-install:
-  - sudo apt-get install libsdl2-dev
-script:
-    - cargo build
-    - cargo test
-    - cargo doc
-after_success:
-    - curl http://www.rust-ci.org/artifacts/put?t=$RUSTCI_TOKEN | sh