Stick to one Style of indenting Arrays

[cocker-cc]

For YAML there are two equally valid styles of indenting Arrays:
Elements indenting the Dash:

a:
  - bli
  - bla
  - blubb

Elements not indenting the Dash:

b:
- schni
- schna
- schnuck

yaml-sort should stick with one of them. As the Output of Ruby's Hash#to_yaml uses "not indenting Array-Elements" I strongly prefer this one.

[smortex]

The initial idea is to stick to the current file style: reorder items without changing the way items are written (e.g. do not remove redundant quotes or reindent lists).

But I have nothing against such an opt-in feature to add support for "normalization".

[cocker-cc]

opt-in feature to add support for "normalization"

👍