Release 8.4.0

🚀 Enhancement

• #1029 Calculate upload rate (@gilest)

📝 Documentation

• #1024 Website demo – support HTTP uploads (@gilest)
• #1023 Use <template> tag on docs website (@gilest)
• #1022 Adjustable upload speed and queue metrics on demo page (@gilest)

🏠 Internal

• #1031 Move release-it to the root, add root scripts (@RobbieTheWagner)
• #1021 Add lengthComputable: false event to progress unit tests (@mkszepp)
• #1018 Upgrade ember-cli to 5.4 (@gilest)

Committers: 3

• Giles Thompson (@gilest)
• Robbie Wagner (@RobbieTheWagner)
• @mkszepp