Fix Rome instructions (#2184)

Author: paulb777

Rome.md

@@ -30,7 +30,14 @@ $ gem install cocoapods-rome
 
 ## Firebase Installation
 
-1. Copy the [template Podfile](Rome/Podfile) to your project directory
+Prefix a Podfile with the following:
+```
+plugin 'cocoapods-rome',
+    dsym: false,
+    configuration: 'Release'
+```
+Then do the following steps:
+
 1. Delete any Firebase pods that you don't need
 1. Run `pod install`
 1. With the Finder `open Rome`