The delete (short option "d") will delete the YAML subtree at the
provided path in the specified file (or STDIN), if it the node exists.
More complex support is currently omitted, for example:
- specify nodes to delete using an external script
- deleting common elements from all elements of an array
Although printing the string as a yaml block can be argued to be technically correct, in practical terms it's more useful to just print out the multiline string as is.
