Read labels from json file

[thomasgalliker]

Thanks for this tool! Well appreciated community effort!

Idea
Just one idea that came across my mind: It would be wonderful if I could provide a labels.json file which contains the absolute list of labels (incl. name, description and color) to be applied for all selected repositories.

API Changes
It would need another parameter --source (or similar) which takes the path to the json file.

Sample file

[
  {
    "name": "bug",
    "color": "d73a4a",
    "description": "Something isn't working"
  },
  {
    "name": "enhancement",
    "color": "a2eeef",
    "description": "New feature or request"
  },
  {
    "name": "platform/android",
    "color": "1d76db",
    "description": "Related to Android platform"
  },
  {
    "name": "platform/ios",
    "color": "5319e7",
    "description": "Related to iOS platform"
  },
  {
    "name": "refactoring",
    "color": "8b80ba",
    "description": "Code refactoring task"
  },
  {
    "name": "s/needs-info",
    "color": "fef2c0",
    "description": "Issue needs more info from the author"
  },
  {
    "name": "question",
    "color": "d876e3",
    "description": "Further information is requested"
  },
  {
    "name": "help wanted",
    "color": "008672",
    "description": "Extra attention is needed"
  },
  {
    "name": "wontfix",
    "color": "ffffff",
    "description": "This will not be worked on"
  },
  {
    "name": "duplicate",
    "color": "cccccc",
    "description": "This issue or PR already exists"
  }
]