Merge pull request #2 from miningbrownie/staging

Staging
modify version in pom.xml
Merge pull request #3 from miningbrownie/staging

Staging
[maven-release-plugin] prepare release mushikago-java-sdk-2.4.4
[maven-release-plugin] prepare for next development iteration
revise typo
add exception handling
Change tombo
Change mitsubachi
change error message
Merge branch 'feature/add_exception_handling' into develop
Merge branch 'master' into release/mushikago-java-sdk-2.4.5
Merge branch 'release/mushikago-java-sdk-2.4.5'