Prepare 0.4.21 release

Yury Selivanov · Yury Selivanov · commit 2f6e77fbc14d · 2015-10-19T23:14:35.000-04:00
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "MagicPython",
-  "version": "0.4.20",
+  "version": "0.4.21",
   "engines": {
     "atom": "*",
     "node": "*"
