chore(package): update scratch-blocks to version 0.1.0-prerelease.1521142086
chore(package): update scratch-blocks to version 0.1.0-prerelease.1521142086

Closes #1603
cwillisf/scratch-gui,LLK/scratch-gui,LLK/scratch-gui,cwillisf/scratch-gui,cwillisf/scratch-gui