Update developer_setup.md

Rugged requires `cmake` and `pkg-config`. Ran into build errors without this one yesterday on Mac...but adding pkg-config enabled setup script to work. See install notes for rugged: https://github.com/libgit2/rugged#install
yanirq · Nov 1, 2017 · fa5be7b · fa5be7b
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diff --git a/developer_setup.md b/developer_setup.md
@@ -117,6 +117,7 @@
 
   ```bash
   brew install git
+  brew install pkg-config
   brew install memcached
   brew install postgresql
   brew install cmake