README documentation for config is stale

[haysclark]

It appears that the README.md is out of date with the latest default config file from v0.10.0

Running commitlint config create will generate the following file, which does not match Default Config section of README.md.

version: v0.10.0
formatter: default
rules:
- header-min-length
- header-max-length
- body-max-line-length
- footer-max-line-length
- type-enum
severity:
  default: error
settings:
  body-max-length:
    argument: -1
  body-max-line-length:
    argument: 72
  body-min-length:
    argument: 0
  description-max-length:
    argument: -1
  description-min-length:
    argument: 0
  footer-enum:
    argument: []
  footer-max-length:
    argument: -1
  footer-max-line-length:
    argument: 72
  footer-min-length:
    argument: 0
  footer-type-enum:
    argument: []
  header-max-length:
    argument: 50
  header-min-length:
    argument: 10
  scope-charset:
    argument: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/,
  scope-enum:
    argument: []
    flags:
      allow-empty: true
  scope-max-length:
    argument: -1
  scope-min-length:
    argument: 0
  type-charset:
    argument: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
  type-enum:
    argument:
    - feat
    - fix
    - docs
    - style
    - refactor
    - perf
    - test
    - build
    - ci
    - chore
    - revert
  type-max-length:
    argument: -1
  type-min-length:
    argument: 0