Release 2.0.0-alpha.1

Release 1.8.1 with latest cargo fmt applied

Reduce package size

Release 1.7.1

Prepare for 1.7.0 release.

Prepare for 1.5.0 release.

Prepare for 1.4.0 release.

Merge pull request #55 from frewsxcv/1.3.2

Prepare for 1.3.2 release.

Merge pull request #51 from frewsxcv/1.3.1

Prepare for 1.3.1 release.

Prepare for 1.3.0 release.