chore(package): update scratch-blocks to version 0.1.0-prerelease.1539267627
chore(package): update scratch-blocks to version 0.1.0-prerelease.1539267627

Closes #3340
LLK/scratch-gui,cwillisf/scratch-gui,LLK/scratch-gui,cwillisf/scratch-gui,cwillisf/scratch-gui