Fix API reference link
Fix API reference link

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