Fix typo in emma.rb

[RobertLowe]

sigh

[jayzes]

Would be awesome to get this merged - it just bit me with a cryptic error that took a bit to diagnose:

TypeError: #<Emma::Client:0x007fa55d159640 @account_id="xxxxxx", @public_key="xxxxx", @private_key="xxxxx", @debug=nil, @default_params={:basic_auth=>{:username=>"xxxxx", :password=>"xxxxxx"}}> is not a symbol nor a string

Failing that, for anyone running across this issue, using a block like this instead of the recommended Emma::Setup one works just fine:

em = Emma::Client.new(account_id: ENV['EMMA_ACCOUNT_ID'],
                             public_key: ENV['EMMA_PUBLIC_KEY'],
                             private_key: ENV['EMMA_PRIVATE_KEY'])

[RobertLowe]

3 years, finally a comment, the system works! 😜