Updated readme example

Author: logankilpatrick

README.md

@@ -15,7 +15,7 @@ julia> ]
 ```
 _Note that this will not work till the package is registered._
 
-For the time being do: 
+For the time being do:
 ```julia
 julia> ]
 (v1.3) pkg> add https://github.com/logankilpatrick/Slack.jl.git
@@ -36,12 +36,48 @@ julia> data = "Hello World"
 julia> response = sendtoslack(data, endpoint)
 "ok"
 ```
-The result of running this code produces the following in the test Slack Workspace: 
+The result of running this code produces the following in the test Slack Workspace:
 
 ![logo](assets/readme.png)
 
 To learn more about how data should be formatted before sending it as a argument to the above code, check out the [Slack API Docs](https://api.slack.com/messaging/composing/formatting).
 
+
+And here is a more complicated example using attachments:
+
+```julia
+julia> using Slack
+
+julia> endpoint = "/services/TQVJBU534/BR8C1LMPS/42thawJz34SWSgZCpniyLBSE"
+"/services/TQVJBU534/BR8C1LMPS/42thawJz34SWSgZCpniyLBSE"
+
+julia> attachment = Dict("attachments" => [Dict("fallback" => "Required plain-text summary of the attachment",
+                                               "color" => "#36a64f",
+                                               "pretext" => "Optional text that appears above the attachment block",
+                                               "author_name" => "Bobby Tables",
+                                               "author_link" => "http://flickr.com/bobby/",
+                                               "author_icon" => "http://flickr.com/icons/bobby.jpg",
+                                               "title" => "Slack API Documentation",
+                                               "title_link" => "https://api.slack.com/",
+                                               "text" => "Optional text that appears within the attachment",
+                                               "fields" => [Dict("title" => "Priority",
+                                                   "value" => "High",
+                                                   "short" => false
+                                                   )]
+                                           )])
+Dict{String,Array{Dict{String,Any},1}} with 1 entry:
+  "attachments" => Dict{String,Any}[Dict("author_link"=>"http://flickr.com/bob"
+
+
+julia> response = sendattachmenttoslack(attachment, endpoint)
+"ok"
+
+```
+
+The result of running this code produces the following in the test Slack Workspace:
+
+![logo](assets/readme2.png)
+
 ## Testing
 I have gone through the trouble of setting up a Slack Workspace in order to test this package. After this is all stabilized, I will remove the endpoint from the Slack Workspace and deprecate the examples you see throughout this repo.