Use spaces in .travis.yml

services/chat/.travis.yml

@@ -1,14 +1,14 @@
 language: node_js
 
 node_js:
-	- "0.10"
+    - "0.10"
 
 before_install:
-	- npm install -g grunt-cli
+    - npm install -g grunt-cli
 
 install:
-	- npm install
-	- grunt install
+    - npm install
+    - grunt install
 
 script:
-	- grunt test:unit
+    - grunt test:unit