Update package.json

package.json

@@ -104,6 +104,7 @@
     "redux-throttle": "0.1.1",
     "rimraf": "^2.6.1",
     "scratch-audio": "0.1.0-prerelease.20190114210212",
+    "scratch-blocks": "0.1.0-prerelease.1548864869",
     "scratch-l10n": "3.1.20190130142816",
     "scratch-paint": "0.2.0-prerelease.20190114205252",
     "scratch-render": "0.1.0-prerelease.20190128154859",