Keybase not updating!

1. Keybase 1.0.18-20161101165331 does not seem to want to update to the latest version.

```
2017/01/10 22:04:25 INFO Request "https://api.keybase.io/_/api/1.0/pkg/update.json?auto_update=0&install_id=*********REMOVED**********&os_version=10.12.2&platform=darwin&run_mode=prod&upd_version=0.2.6&version=1.0.18-20161101165331%2Ba862115"
2017/01/10 22:04:27 DEBG Received update response: updater.Update{Version:"1.0.18-20161219185928+7868d49", Name:"v1.0.18-20161219185928+7868d49", Description:"Recent changes:\n---------------\n- Folders view! You can browse your public and private folders and see new sharing requests inside the app.\n\n- Search from the app! Want to share data in KBFS with a Twitter user? Just click the Twitter bird and type their username. This will popup a folder for you, and if they're not on Keybase yet, and invitation code to share.\n\n- Support for macOS 10.12 (Sierra).\n\n- Introducing the main GUI screen. This is where you'll look people up, manage your folders, and perform other actions. A lot of the features are stubbed out, but you can start playing with it.\n\n- Sharing before signup! Go ahead and put data in /keybase/private/you,friend@twitter/. If you have any invite codes, this will pop up a window with a link to DM them. It also works for end-to-end encryption with Reddit, Coinbase, Github, and Hacker News users.\n\nSmall stuff:\n------------\n- Various bug fixes and improvements\n\nWhat we are currently working on:\n---------------------------------\n- KBFS performance, including delayed writes\n- profile editing and proof generation inside the GUI\n", InstallID:"**********REMOVED*********", RequestID:"", Type:0, PublishedAt:1482173968000, Props:[]updater.Property(nil), Asset:(*updater.Asset)(0xc4201aa820), NeedUpdate:false}
```
2. Not important, but very curious as a developer myself -- what is the "_" in the API uri for?

```
https://api.keybase.io/_/api/1.0/pkg/update.json
```