Update README.md

Deleting line copied from appmaker, as this is 'the app-maker components project'.
Merge pull request #85 from adamlofting/patch-1

Update README.md
Fixing a few bugs with average-number
Removing console log.
popcorn maker integration
Merge pull request #86 from mozilla/popcorn-maker-component

popcorn maker integration
minor bug fixes and enhancements to PM component
popcorn postmessage domain
Merge pull request #87 from secretrobotron/popcorn-component-enhancements

minor bug fixes and enhancements to PM component
Adding start and stop metronome.
popcorn maker component uses staging & prod
Merge pull request #89 from secretrobotron/popcorn-maker-prod

popcorn maker component uses staging & prod
Just Giving donation app first commit