chore(package): update shower-ribbon to version 2.0.6

https://greenkeeper.io/

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "shower-core": "^2.0.6",
     "shower-material": "^1.0.4",
-    "shower-ribbon": "^2.0.5"
+    "shower-ribbon": "^2.0.6"
   },
   "devDependencies": {
     "del": "^2.2.1",