v3.0.0

What's Changed

• Remove alternative converter support by @laurynas-convertapi in #32
• Switch to authorization header by @laurynas-convertapi in #33

API credentials setting changed:

ConvertApi.configure do |config|
  config.api_credentials = 'your-api-secret-or-token'
end

Full Changelog: v2.0.0...v3.0.0