Fix indention

Signed-off-by: Taylor Silva <tsilva@pivotal.io>

pipelines/hello-world.yml

@@ -11,4 +11,4 @@ jobs:
         source: { repository: busybox }
       run:
         path: echo
-        args: ["Hello, world!"]
+        args: ["Hello world!"]

tasks/hello-world.yml

@@ -6,4 +6,4 @@ image_resource:
 
 run:
   path: echo
-  args: ["Hello, world!"]
+  args: ["Hello world!"]