Readme: badgese for travis and package version (dart-lang/stream_transform#110)

pkgs/stream_transform/README.md

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+[![Build Status](https://travis-ci.org/dart-lang/stream_transform.svg?branch=master)](https://travis-ci.org/dart-lang/stream_transform)
+[![Pub package](https://img.shields.io/pub/v/stream_transform.svg)](https://pub.dev/packages/stream_transform)
+
 Extension methods on `Stream` adding common transform operators.
 
 # Operators