chore(package): update scratch-audio to version 0.1.0-prerelease.20180625202813
chore(package): update scratch-audio to version 0.1.0-prerelease.20180625202813

Closes #2460
LLK/scratch-gui,LLK/scratch-gui,cwillisf/scratch-gui,cwillisf/scratch-gui,cwillisf/scratch-gui