Update README.md

Author: alanjcharles

README.md

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 Add Firebase device mode support to your applications via this plugin for [Analytics-Swift](https://github.com/segmentio/analytics-swift)
 
+⚠️ **Github Issues disabled in this repository** ⚠️
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+Please direct all issues, bug reports, and feature enhancements to `[email protected]` so they can be resolved as efficiently as possible. 
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 ## Adding the dependency
 
 ***Note:** the Firebase library itself will be installed as an additional dependency.*