Initialize dart-lang/tuple with the tuple package at v1.0.1.

README.md

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+# Tuple data structure
+
+- [Tuple2], [Tuple3]...
+
+[![Build Status](https://travis-ci.org/kseo/tuple.svg)](https://travis-ci.org/kseo/tuple)
+[![Coverage Status](https://coveralls.io/repos/kseo/tuple/badge.svg?branch=master&service=github)](https://coveralls.io/github/kseo/tuple?branch=master)
+
+## Usage example
+
+```dart
+const t = const Tuple2<String, int>('a', 10);
+
+print(t.item1); // prints 'a'
+print(t.item2); // prints '10'
+```
+
+```dart
+final t1 = const Tuple2<String, int>('a', 10);
+final t2 = t1.withItem1('c');
+// t2 is a new [Tuple2] object with item1 is 'c' and item2 is 10.
+```