Explicitly set redirect: follow on the precaching requests. (#233)

service-worker.tmpl

@@ -77,7 +77,10 @@ self.addEventListener('install', function(event) {
           Array.from(urlsToCacheKeys.values()).map(function(cacheKey) {
             // If we don't have a key matching url in the cache already, add it.
             if (!cachedUrls.has(cacheKey)) {
-              return cache.add(new Request(cacheKey, {credentials: 'same-origin'}));
+              return cache.add(new Request(cacheKey, {
+                credentials: 'same-origin',
+                redirect: 'follow'
+              }));
             }
           })
         );