Bump version: 8.1.0 → 8.2.0

Merge pull request more-itertools#369 from erikrose/version-8.1.0

Version 8.1.0

Bump to 8.0.2

Changes for 8.0.1

Merge pull request more-itertools#347 from erikrose/8.0.0-release

8.0.0 release

Merge pull request more-itertools#299 from erikrose/version-7.2.0

Changes for 7.2.0

Merge pull request more-itertools#293 from erikrose/version-7.1.0

Changes for 7.1.0

Merge pull request more-itertools#280 from erikrose/version-6.1.0

Updates for 7.0.0

Merge pull request more-itertools#271 from erikrose/6.0-release

Additional changes for 6.0.0 release notes

Merge pull request more-itertools#252 from erikrose/version-5.0.0

Updates for version 5.0.0