Sopel-github

Changed:
* Skip trying to handle non-repo links, e.g. to topics (97)

Fixed:
* Issue comment handling tries to access state (95)
* Error in cases where issue/PR body is empty (98)

Added:
* Include issue/PR state when fetching info (87)

Changed:
* Link shortening failures will be logged for debugging (88)

Added:
* Include link to issue/PR in output when triggered by bare numeric reference
in chat (85)

Fixed:
* Double space in output of "self-assigned" webhook events (80)

Added:
* Optionally treat references like `123` in chat as issue references,
configurable per-channel with new `.gh-repo` command (65)
* Webhook handling for issue transfer events (75)
* Rudimentary handling for links to files (76)
* Will try to show a useful text snippet if link points to a line/range
* Webhook handling for PR converted from Ready to Draft (77)

Changed:
* PR output includes more details (69)
* Author's name added if merged PR was not created by the merging user
* Repo owner's name added to refs if PR head branch is in a fork
* Commit references in webhook output will be abbreviated in most cases (78)
* Include title in assignee, label, & milestone webhook output (79)

Fixed:
* Skip label-related events that do not include the label object (66)
* Avoids channel spam when deleting a label, for example
* Correct fallback behavior for `.gh` command with no argument (68)
* Avoid "Socket already in use" error when IRC reconnects (72)

Fixed:
* Unhandled exception on linked issue/PR with empty description (67)

Fixed:
* Use of deprecated method `bot.msg()` (63)
* Use of deprecated `bot.privileges` property (64)