tuple

• Update the readme to indicate that this package is considered feature complete.
• Require Dart 2.17.

• fix the CI badge

• update the branch name

• remove 'strict-casts' (not supported on Dart 2.14)

• Remove the dependency on package:quiver.
• Require Dart 2.14.0.
• Switch to using package:lints/recommended.yaml for analysis.

• Stable null safety release.
• Require Dart 2.12.0.

• Require Dart 2.0.0.
• Fixed Tuple7's operator==.

• Prepare for Dart 2 stable.

Changed dependency to quiver.core, but otherwise identical to v1.0.1 tag for the tuple package.

• Fix all strong-mode warnings and errors.

• Remove _hash function and use quiver_hashcode package instead.

• Add fromList factory constructor.
• Add Tuple6 and Tuple7 classes.

• Add toList method.

• Rename PersistentTuple classes to Tuple; remove Tuple classes.
• Rename each iN item to itemN.
• Rename setIN to withItemN.

• Fix a bug in == operator of PersistentTuple classes.

• Add operator == and hashCode to classes, so that tuples may be used as keys in hashes.

• Initial release.