feat(emitter): Quote values

[reneleonhardt]

Features

• Quote values ("dependabot style")

[reneleonhardt]

Notes

• Many maintainers declare dependabot.yaml by quoting all values

Original

string: foo
integer: 42
real: 1.2
boolean: true
array: [1]
hash: {a: 1}

Quoted values

string: "foo"
integer: "42"
real: "1.2"
boolean: "true"
array:
  - "1"
hash:
  a: "1"