updated service worker to cache bbtSnapExtension.js

HISTORY.md

@@ -49,6 +49,7 @@
 
 ### 2021-10-27
 * included bbt extensions
+* updated service worker to cache bbtSnapExtension.js
 
 ### 2021-10-26
 * objects: don't show codification and js-func blocks in search results unless enabled

sw.js

@@ -83,6 +83,7 @@ var cacheName = 'snap-pwa',
         'libraries/biginteger.js',
         'libraries/bignumbers.xml',
         'libraries/bignums.js',
+        'libraries/bbtSnapExtension.js',
         'libraries/cases.xml',
         'libraries/colors.xml',
         'libraries/Eisenbergification.xml',