mention php extensions

Jeremy Kauffman · web-flow · commit 583e9e702547 · 2019-01-28T15:03:18.000-05:00
diff --git a/INSTALL.md b/INSTALL.md
@@ -7,6 +7,7 @@ To run this project, you'll need to have either PHP7 or Docker installed, and be
 ## Running Locally
 
 - Install [PHP7](http://php.net/downloads.php)
+- Possibly install additional PHP extensions: `curl`, `xml`, `mbstring`, `dom`
 - Checkout the project
 - Run `./dev.sh` from the project root
 - Access [localhost:8000](http://localhost:8000) in your browser
