docs(): add info about direct messaging

stevenosloan · Sep 7, 2018 · 4bf6582663dc9e5070afe3fdc42d67c14a513354 · 4bf6582
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@@ -262,6 +262,14 @@ notifier.post text: "hello", channel: ["default", "all_the_things"]
 # => will post "hello" to the default and all_the_things channel
 ```
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+To send a message directly to a user, their username [no longer works](https://github.com/stevenosloan/slack-notifier/issues/51#issuecomment-414138622). Instead you'll need to get the user's ID and set that as the channel.
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+At the time of writing, one way to get a user's ID is to:
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+- go to their profile
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+- click **...** ("More actions")
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+- click **Copy Member ID**
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 ### Writing your own Middleware
 Middleware is fairly straightforward, it is any class that inherits from `Slack::Notifier::PayloadMiddleware::Base` and responds to `#call`. It will always be given the payload as a hash and should return the modified payload as a hash.