.travis.yml: Correct additional packages list

The list of additional packages in our .travis.yml (mostly libraries needed
for specific modules) was incorrectly formatted.  So travis was attempting
to install the "libjudy-dev libvorbis-dev libportaudio-dev libtalloc-dev"
packagde (spaces included) which obviously didn't work.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

.travis.yml

@@ -8,7 +8,10 @@ compiler:
 addons:
     apt:
         packages:
-            - libjudy-dev libvorbis-dev libportaudio-dev libtalloc-dev
+            - libjudy-dev
+            - libvorbis-dev
+            - libportaudio-dev
+            - libtalloc-dev
 
 script:
         - make config.h