Proper quoting for "Hello World!" test

Author: sdelafond

.travis.yml

@@ -15,5 +15,5 @@ install:
 
 script:
   - sudo modprobe fuse
-  - mkdir /tmp/foo && python example/hello.py /tmp/foo && [ $(cat /tmp/foo/hello) = "Hello World!" ]
+  - mkdir /tmp/foo && python example/hello.py /tmp/foo && [ "$(cat /tmp/foo/hello)" = "Hello World!" ]
   - mkdir /tmp/bar && python example/fioc.py /tmp/bar && [ -f /tmp/bar/fioc ]