chore(package): update scratch-paint to version 0.2.0-prerelease.20190318170811

package.json

@@ -107,7 +107,7 @@
     "scratch-audio": "0.1.0-prerelease.20190114210212",
     "scratch-blocks": "0.1.0-prerelease.1552662801",
     "scratch-l10n": "3.1.20190220143732",
-    "scratch-paint": "0.2.0-prerelease.20190311150519",
+    "scratch-paint": "0.2.0-prerelease.20190318170811",
     "scratch-render": "0.1.0-prerelease.20190312125229",
     "scratch-storage": "1.2.2",
     "scratch-svg-renderer": "0.2.0-prerelease.20190304180800",