Update plugins no longer forceable

• I am on the latest Hyper.app version

• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: macOS 10.13.2

• Hyper.app version: 2.0.0-canary.8

• Link of a Gist with the contents of your .hyper.js: https://github.com/dcalhoun/dotfiles/blob/master/hyper.js

• Relevant information from devtools: n/a

• The issue is reproducible in vanilla Hyper.app: No, requires a plugin to be installed.

Issue

The ability to force a check of plugin updates is no longer possible.

Steps to Reproduce

1. Launch Hyper
2. Plugins > Update (Cmd+Shift+U)

Expected Result

Hyper attempts to update all plugins. Displays a notification with one of the following messages:

• Restart the app or hot-reload with "View" > "Reload" to enjoy the updates!

• No changes!

Actual Result

No notifications are displayed; Hyper seemingly does not update any plugin.

Start by comparing the plugin-update changes linked from pull request 2412, then reproduce the Cmd+Shift+U action in Hyper with a plugin installed. Trace the update path and notification handling; done means a forced update attempts all plugins and displays either the restart/hot-reload or no-changes notification described in the issue.