Add option to ignore spacing on lists

[droslean]

Since this plugin is with built-in Kubernetes syntax, we need also an option to ignore spaces on lists.

Now the plugin forces this

my_list:
  - 1
  - 2
  - 3

But in Kubernetes we don't do that since it is using the golang YAML library which outputs the list as

my_list:
- 1
- 2
- 3