Earnie CLI 0.5.0

Added

• A webhook notification channel can post a markdown message to chat platforms
  that take "POST JSON with a message field and an API key header" (Mattermost,
  Discord, relays and messengers with an API key). earnie notifications channels create --kind webhook and channels update gain
  --webhook-format earnie|message, --webhook-field <key> (the JSON key that
  holds the markdown, default text) and --webhook-auth-header <name> (an API
  key header such as X-API-Key; an empty value on update removes it). The
  header value is a secret, so it has no flag: the channel is saved disabled and
  a person enters it in Settings > Notifications. channels update with a
  webhook flag merges with the stored webhook settings, which needs
  organization:read. channels list and the other channel commands report
  the new webhook_format, webhook_field and webhook_auth_header members.
  The generated Go client pkg/earnieclient gains the new webhook settings.
• earnie notifications channels create --kind teams creates a Microsoft Teams
  channel, a Workflows webhook ("When a Teams webhook request is received").
  Like Slack it takes no URL flag: the channel is saved disabled and a person
  pastes the workflow URL in Settings > Notifications. channels list reports
  such a channel as needing its secret, and notifications test reports the new
  teams_workflow_unavailable reason. The generated Go client
  pkg/earnieclient gains the teams channel kind.

Changed

• The server now limits the checks that call a third party to 10 a minute per
  person or API key: earnie integrations verify, earnie notifications test
  and the SCANOSS key check earnie doctor runs. A call past the limit comes
  back as HTTP 429 with the server's message, which the CLI reports as a
  retryable error. None of these commands repeats the call on its own, and
  earnie doctor goes on to read the last recorded status. The generated Go
  client pkg/earnieclient gains the 429 response on those three operations.
• The generated Go client pkg/earnieclient knows that a GitLab project can be
  bound with its webhook left for an admin to install: a project carries
  repo_webhook_pending_manual and a bulk import counts such hooks as manual.
  No CLI command changes.
• The generated Go client pkg/earnieclient gains the optional context field
  on oss-diff finding evidence, the label that says why SCANOSS reported a
  full-file candidate. No command reads it yet.