but these conflict with your requirements or minimum-stability

Question

I am creating my own slackbot. I decided to use project as a library to help me.

https://github.com/sagebind/slack-client/issues?utf8=%E2%9C%93&q=stability

Answer 1

You should never manually edit the composer.lock file - it is an automatically generated file.

It looks like you've shown the composer.json file of the package you're trying to require rather than your own project's composer.json. The prefer-stable and minimum-stability properties should be added to your project root's composer.json file:

{
  "name": "xFlare/slack-bot",
  "description": "xFlare's Slack bot project",
  "authors": [
    {
      "name": "xFlare"
    }
  ],
  "minimum-stability": "dev",
  "prefer-stable": true,
  "require": {
    "php": ">=5.5",
    "coderstephen/slack-client": "^0.3.0"
  }
}