Removed fixed dependencies

packages/isolate/README.md

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+[![Build Status](https://travis-ci.org/dart-lang/isolate.svg?branch=master)](https://travis-ci.org/dart-lang/isolate)
+[![Coverage Status](https://coveralls.io/repos/dart-lang/isolate/badge.svg?branch=master)](https://coveralls.io/r/dart-lang/isolate)
+
+Helps with isolates and isolate communication in Dart.
+
+The package contains individual libraries with different purposes.
+
+### Creating send ports and responding to messages.
+
+The "ports.dart" sub-library contains functionality
+for creating `SendPort`s and reacting to values sent to those ports.
+
+### Working with isolates and running functions in other isolates.
+
+The "isolate_runner.dart" sub-library introduces an `IsolateRunner` class
+that gives easy access to the `Isolate` functionality, and also
+gives a way to run new functions in the isolate repeatedly, instead of
+just on the initial `spawn` call.
+
+### A central registry for values that can be used across isolates.
+
+The "registry.dart" sub-library provides a way to create an
+object registry, and give access to it across different isolates.
+
+### Balancing load across several isolates.
+
+The "load_balancer.dart" sub-library can manage multiple `Runner` objects,
+including `IsolateRunner`, and run functions on the currently least loaded
+runner.
+
+## Features and bugs
+
+Please file feature requests and bugs at the [issue tracker][tracker].
+
+[tracker]: https://github.com/dart-lang/isolate/issues