v1.6.3-rc.1

Full Changelog

• Fix electron context menu copy/save-as
  #96
• Fixed error in README.md/User-specified config.json
  #97
• Update Modular hosting link
  #92
• Enforce sandbox on all spawned BrowserWindow objects
  #91
• Run before-quit on updates too to flush rageshake
  #93
• Enable new room list labs flag
  #87
• Add asar-webapp script
  #59
• Bump acorn from 6.4.0 to 6.4.1
  #50
• Enable font scaling flag for nightly
  #89
• Enable IRC UI labs flag in nightly
  #88
• Update help message to fix broken url to electron docs
  #86