Release 0.3.13. (#114)

Release 0.3.12. (#111)

Release 0.3.11. (#109)

Release 0.3.10 (#103)

Release 0.3.9 (#96)

Release 0.3.8. (#94)

Release 0.3.7. (#90)

Release 0.3.6. (#87)

Release 0.3.5. (#83)

Release 0.3.4 (#81)

* Update CHANGELOG.md.

* Update Cargo.toml.