chore(package): update scratch-blocks to version 0.1.0-prerelease.1531409796
chore(package): update scratch-blocks to version 0.1.0-prerelease.1531409796

Closes #2602
cwillisf/scratch-gui,LLK/scratch-gui,cwillisf/scratch-gui,cwillisf/scratch-gui,LLK/scratch-gui