Comments inside maps aren't indented

[BrainStone]

So maybe I'm really doing something very wrong here but when I try to place comments inside a map (I want a comment right before a key) the comments are not indented at all.

So I tried this code

YAML::Emitter out;

out << YAML::BeginMap << YAML::Key << "foo"
    << YAML::BeginMap << YAML::Comment("Comment")
    << YAML::Key << "bar" << YAML::Value << true
    << YAML::EndMap << YAML::EndMap;

I would expect this to output

foo:
  # Comment
  bar: true

but it outputs

foo:
# Comment
  bar: true

[alexprabhat99]

Hi @SGSSGene , could you please review this PR: #1426?
Any feedback would be greatly appreciated. Thanks!