hub: Update to 2.14.0

Changes:
2.14.0
------
Features:
* New command: `hub issue update` #2432
* New command: `hub issue transfer` #2363
* Support git flag `hub version --build-options` #2440
* Refuse to follow HTTP 301/302 redirects for non-GET requests #2442

Fixes:
* Fix `hub help <cmd>` on Windows #2384
* Ensure that `grep` command is being used in shell completions #2390
* Consult global `git config color.ui` setting when `--color=auto` #2378

Improvements:
* Print more user-friendly HTTP 40x errors #2446
* Enable debugging file uploads via `HUB_VERBOSE=1 hub release create -a <file>`
* Improve parsing malformed YAML config files #2380

(leot)