Update Development-guide.md (mastodon#340)

in order to install ruby-idn we need to make sure we have libidn installed.
Valeriyy · Jul 15, 2017 · e0f6fb4 · e0f6fb4
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diff --git a/Running-Mastodon/Development-guide.md b/Running-Mastodon/Development-guide.md
@@ -110,6 +110,7 @@ These are self-contained instructions for setting up a development environment o
 ### Installation
 
 ```
+brew install libidn
 bundle install --with development
 yarn install --pure-lockfile
 gem install foreman --no-ri --no-rdoc