dexie-export-import README: clarify how blobs can be retrieved and used.
dexie-export-import README: clarify how blobs can be retrieved and used.

dfahlander/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js,dfahlander/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js,jimmywarting/Dexie.js,jimmywarting/Dexie.js