Update scratch paint, adds gradient fills

package.json

@@ -98,7 +98,7 @@
     "scratch-audio": "0.1.0-prerelease.20180625202813",
     "scratch-blocks": "0.1.0-prerelease.1531482946",
     "scratch-l10n": "3.0.20180712200642",
-    "scratch-paint": "0.2.0-prerelease.20180717182448",
+    "scratch-paint": "0.2.0-prerelease.20180717212631",
     "scratch-render": "0.1.0-prerelease.20180618173030",
     "scratch-storage": "0.5.1",
     "scratch-svg-renderer": "0.2.0-prerelease.20180712223402",