Fix README documentation for configuring window size (#395)
Fix README documentation for configuring window size (#395)

The README stated that you could set an option in application config,
but that was not the case. The correct way to configure the default
window size is to pass the option in to the Wallaby.start_session/1
function.
aaronrenner/wallaby,keathley/wallaby,keathley/wallaby,aaronrenner/wallaby