Update README.md

Add back the `+` to the line.

Update README.md
Add back the `+` to the line.
9c1b881d · Windham Wong · GitHub · ff04cc19 · 9c1b881d
Commit 9c1b881d authored Aug 06, 2018 by Windham Wong Committed by GitHub Aug 06, 2018
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@@ -289,7 +289,7 @@ cd ios && pod init
 Edit the newly created `Podfile`:
 ```diff
  # Pods for YOURAPP
-  pod 'Firebase'
+ pod 'Firebase'
 + pod 'Firebase/Messaging'
 ```