Merge pull request #30 from kawakamimoeki/bump-up-version-to-v0.2.1

Bump up to 0.2.1

Merge pull request #28 from kawakamimoeki/bump-up-version-to-v0.2.0

Bump up to 0.2.0

Merge pull request #24 from kawakamimoeki/bump-up-version-to-v0.1.12

Bump up to 0.1.12

Merge pull request #18 from kawakamimoeki/bump-up-to-0.1.11

Bump up to 0.1.11

Bump up to 0.1.10

Bump up to 0.1.9

Bump up to 0.1.7

Bump up version to v0.1.8

Bump up version to v0.1.6

Bump up version to v0.1.5