Tweak travis build

Author: alexcrichton

.travis.yml

@@ -1,20 +1,21 @@
 language: rust
-rust:
-  - stable
-  - beta
-  - nightly
-sudo: false
-before_script:
-  - pip install 'travis-cargo<0.2' --user && export PATH=$HOME/.local/bin:$PATH
+matrix:
+  include:
+    - rust: stable
+    - rust: beta
+    - rust: nightly
+    - name: "master doc to gh-pages"
+      rust: nightly
+      script:
+        - cargo doc --no-deps
+      deploy:
+        provider: script
+        script: curl -LsSf https://git.io/fhJ8n | rustc - && (cd target/doc && ../../rust_out)
+        skip_cleanup: true
+        on:
+          branch: master
 script:
   - cargo test --verbose
-  - cargo doc --no-deps
-after_success:
-  - travis-cargo --only nightly doc-upload
-env:
-  global:
-    secure: "IA467qqr1j0BpyTqG6hO8Kpt+EUDEjO1pBVhu4+L76/dygkQIwROgqdT7uXZqBPMjU6Rbi0wzGXXHJjbCWVTCjh7U/Q0bK2svtR8DKtM0o1Un/YftSUFt2p/WoiJ9PrkUjKh1rHuoyijpUqAls0JfIz8OdC45egT2SWDufljo+s="
-
 notifications:
   email:
     on_success: never