Add out-of-line keys info to readme
Add out-of-line keys info to readme

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