Update README.md (formatting)
Update README.md (formatting)

Formatting fix for "Pairing with Bitpay.com" ordered list.
bitpay/ruby-cli,bitpay/ruby-client,saizai/ruby-client,Tetpay/ruby-client,bitpay/ruby-cli,Tetpay/ruby-client,saizai/ruby-client,philosodad/ruby-sdk