Indent the travis config to look like serde_json's

.travis.yml

@@ -1,23 +1,28 @@
 sudo: false
 language: rust
+
+# run builds for all the trains (and more)
 rust:
-- 1.13.0
-- stable
-- beta
-- nightly
+  - 1.13.0
+  - stable
+  - beta
+  - nightly
+
 before_script:
-- pip install 'travis-cargo<0.2' --user
-- export PATH=$HOME/.local/bin:$PATH
+  - pip install 'travis-cargo<0.2' --user
+  - export PATH=$HOME/.local/bin:$PATH
+
 script:
-- (cd serde && travis-cargo build)
-- (cd serde && travis-cargo --only beta test)
-- (cd serde && travis-cargo --only nightly test -- --features unstable-testing)
-- (cd serde && travis-cargo build -- --no-default-features)
-- (cd serde && travis-cargo --only nightly build -- --no-default-features --features alloc)
-- (cd serde && travis-cargo --only nightly build -- --no-default-features --features collections)
-- (cd test_suite && travis-cargo --only beta test)
-- (cd test_suite && travis-cargo --only nightly test -- --features unstable-testing)
-- (cd test_suite/no_std && travis-cargo --only nightly build)
+  - (cd serde && travis-cargo build)
+  - (cd serde && travis-cargo --only beta test)
+  - (cd serde && travis-cargo --only nightly test -- --features unstable-testing)
+  - (cd serde && travis-cargo build -- --no-default-features)
+  - (cd serde && travis-cargo --only nightly build -- --no-default-features --features alloc)
+  - (cd serde && travis-cargo --only nightly build -- --no-default-features --features collections)
+  - (cd test_suite && travis-cargo --only beta test)
+  - (cd test_suite && travis-cargo --only nightly test -- --features unstable-testing)
+  - (cd test_suite/no_std && travis-cargo --only nightly build)
+
 env:
   global:
-  - TRAVIS_CARGO_NIGHTLY_FEATURE=""
+    - TRAVIS_CARGO_NIGHTLY_FEATURE=""