Update installation instructions in readme (gobuffalo#42)

* Update README.md * Update README.md
mwolf1989 · May 9, 2019 · f677c9b · f677c9b
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commit f677c9b
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diff --git a/README.md b/README.md
@@ -15,6 +15,7 @@
 
 ```bash
 $ go get -u github.com/gobuffalo/buffalo-auth
+$ buffalo plugins install github.com/gobuffalo/buffalo-auth
 ```
 
 ## Usage