Revert "Update dependencies"

This is to remove the latest svg-renderer change, "add rounded edges to gradient strokes", because we would like to come up with a more comprehensive testing plan before adding it.

Author: DD Liu

package-lock.json

@@ -109,11 +109,11 @@
     "rimraf": "^2.6.1",
     "scratch-audio": "0.1.0-prerelease.20190925183642",
     "scratch-l10n": "3.7.20200128224436",
-    "scratch-blocks": "0.1.0-prerelease.1580827419",
-    "scratch-paint": "0.2.0-prerelease.20200205010220",
-    "scratch-render": "0.1.0-prerelease.20200205011809",
+    "scratch-blocks": "0.1.0-prerelease.1580309823",
+    "scratch-paint": "0.2.0-prerelease.20200204155336",
+    "scratch-render": "0.1.0-prerelease.20200128205403",
     "scratch-storage": "1.3.2",
-    "scratch-svg-renderer": "0.2.0-prerelease.20200205003400",
+    "scratch-svg-renderer": "0.2.0-prerelease.20200109070519",
     "scratch-vm": "0.2.0-prerelease.20191227164934",
     "selenium-webdriver": "3.6.0",
     "startaudiocontext": "1.2.1",