tr callback for get()
tr callback for get()

rubenstolk/IDBWrapper,mizchi/idb-wrapper-promisify,safetychanger/IDBWrapper,mizchi/idb-wrapper-promisify,jensarps/IDBWrapper,jayfunk/IDBWrapper,rubenstolk/IDBWrapper,jensarps/IDBWrapper,safetychanger/IDBWrapper,kilbot/IDBWrapper,jayfunk/IDBWrapper,GerHobbelt/IDBWrapper,kilbot/IDBWrapper