Update Plotly.jl

Author: chriddyp

src/Plotly.jl

@@ -15,7 +15,7 @@ end
 
 default_options = ["filename"=>"Plot from Julia API",
 "world_readable"=> true,
-"layout"=>["title"=>"Plot from Julia API"]]
+"layout"=>[]]
 
 ## Taken from https://github.com/johnmyleswhite/Vega.jl/blob/master/src/Vega.jl#L51
 # Open a URL in a browser