minor edits to README
minor edits to README

tritoanst/ccxt,ccxt/ccxt,tritoanst/ccxt,ccxt/ccxt,aiueogawa/ccxt,ccxt/ccxt,aiueogawa/ccxt,aiueogawa/ccxt,aiueogawa/ccxt,tritoanst/ccxt,tritoanst/ccxt,ccxt/ccxt,ccxt/ccxt