Merge pull request #2560 from rschamp/dedupe-dev-dependencies

Remove duplicate scratch-* dependencies

package.json

@@ -98,10 +98,6 @@
     "scratch-blocks": "0.1.0-prerelease.1530135682",
     "scratch-l10n": "3.0.20180703181510",
     "scratch-paint": "0.2.0-prerelease.20180706154930",
-    "scratch-audio": "0.1.0-prerelease.20180625202813",
-    "scratch-blocks": "0.1.0-prerelease.1530135682",
-    "scratch-l10n": "3.0.20180703181510",
-    "scratch-paint": "0.2.0-prerelease.20180706154930",
     "scratch-render": "0.1.0-prerelease.20180618173030",
     "scratch-storage": "0.5.1",
     "scratch-svg-renderer": "0.2.0-prerelease.20180618172917",