chore(package): update scratch-blocks to version 0.1.0-prerelease.1537975589
chore(package): update scratch-blocks to version 0.1.0-prerelease.1537975589

Closes #3232
LLK/scratch-gui,cwillisf/scratch-gui,LLK/scratch-gui,cwillisf/scratch-gui,cwillisf/scratch-gui