Added build badge

Author: lukeredpath

README.md

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 # swift-coding
 
+![Bitrise Build Badge](https://app.bitrise.io/app/e6e8163c7f141139.svg?token=aVhm-ktqKllsLkhHQ_JrvQ)
+
 A protocol witness-oriented library for creating functional encoding and decodings, built on top of Codable.
 
 [NSScreencasts series on Codable witnesses](https://nsscreencast.com/series/54-codable-witnesses)