Merge pull request #1369 from LLK/greenkeeper/scratch-blocks-0.1.0-prerelease.1517268276

Update scratch-blocks to the latest version 

package.json

@@ -89,7 +89,7 @@
     "redux-throttle": "0.1.1",
     "rimraf": "^2.6.1",
     "scratch-audio": "0.1.0-prerelease.1516198804",
-    "scratch-blocks": "0.1.0-prerelease.1517250005",
+    "scratch-blocks": "0.1.0-prerelease.1517268276",
     "scratch-l10n": "2.0.20180108132626",
     "scratch-paint": "0.1.0-prerelease.20180124235741",
     "scratch-render": "0.1.0-prerelease.1516837442",