support backlog.getProjectSummaries
support backlog.getUser
update package.json for 0.5.0
Merge branch 'release/0.5.0' into develop
add validation for backlog() arguments
support backlog.getProject(projectKey)
update package.json for 0.6.0
Merge branch 'release/0.6.0' into develop
fix backlog.getProject(projectKey) request parameter
update package.json for 0.6.1
Merge branch 'release/0.6.1' into develop