Document minimum CocoaPods version for BuildFrameworks (#272)

paulb777 · morganchen12 · commit cfef233f3953 · 2017-09-14T17:09:48.000-07:00
diff --git a/BuildFrameworks/README.md b/BuildFrameworks/README.md
@@ -11,6 +11,12 @@ CocoaPods](https://cocoapods.org/pods/Firebase) and
 
 ## Usage
 
+The CocoaPods version must be at least 1.3.1.
+
+```
+$ pod --version
+```
+
 ```
 $ ./build.swift -f FirebaseAuth -f FirebaseMessaging ....
 ```
