fix(service-worker): update to fix important issue on FF and Chrome

Link to gdg-x/hoverboard#253 and GDGToulouse/site-devfest-toulouse-2017#23 (and many more GDG website)

Closes #199

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## Unreleased 
+
+* Dependency updates. Upgraded to `[email protected]` minimum to prevent error about corrupted data on Firefox 52 and Chrome 59  (which matches the spec)
+
 ## [1.2.1] - 2017-05-03
 
 * Dependency updates.  Upgraded to new `polymer-bundler`.  Most important update is a fix to bug whereby `lazy-import` links were being moved out of their `<dom-module>` containers.

package.json

@@ -33,7 +33,7 @@
     "polymer-analyzer": "2.0.0-alpha.40",
     "polymer-bundler": "2.0.0-pre.14",
     "polymer-project-config": "^2.0.0",
-    "sw-precache": "^4.2.0",
+    "sw-precache": "^5.1.1",
     "vinyl": "^1.1.1",
     "vinyl-fs": "^2.4.3"
   },