Fix {} to Dict() for Julia v0.4

Author: hewers

README.md

@@ -34,19 +34,19 @@ PlotlyAccount("username","your api key")
 Note: you may also specify your session endpoints using signin as follows: 
 
 ```julia
-julia> Plotly.signin("username","your api key",{"plotly_domain"=> "your_plotly_base_endpoint", "plotly_api_domain"=> "your_plotly_api_endpoint"})
+julia> Plotly.signin("username","your api key",Dict("plotly_domain"=> "your_plotly_base_endpoint", "plotly_api_domain"=> "your_plotly_api_endpoint"))
 ```
 
 ## Saving your credentials
 ```julia
-julia> Plotly.set_credentials_file({"username"=>"your_user_name","api_key"=>"your_api_key"})
+julia> Plotly.set_credentials_file(Dict("username"=>"your_user_name","api_key"=>"your_api_key"))
 ```
 
 Note: your credentials will be saved within /YOUR_HOME_DIR/.plotly/.credentials
 
 ## Saving your endpoint configuration
 ```julia
-julia> Plotly.set_config_file({"plotly_domain"=> "your_plotly_base_endpoint", "plotly_api_domain"=> "your_plotly_api_endpoint"})
+julia> Plotly.set_config_file(Dict("plotly_domain"=> "your_plotly_base_endpoint", "plotly_api_domain"=> "your_plotly_api_endpoint"))
 ```
 
 Note: your configuration will be saved within /YOUR_HOME_DIR/.plotly/.config