Update common-shakeify (#21)

Author: goto-bus-stop

package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "browser-pack-flat": "^3.0.9",
     "bundle-collapser": "^1.3.0",
-    "common-shakeify": "^0.5.2",
+    "common-shakeify": "^0.6.0",
     "envify": "^4.1.0",
     "minify-stream": "^1.1.0",
     "uglifyify": "^5.0.0",