add  6.0.37
add 0.90.0
add 1.6
add 1.6
add 6.0.37
add download central repository
add ignore config/candidates if central available
add ignore db/xxx.txt if central available
adjust determinate version
comment updated
minor update
drop config/candidates
drop db/candidate.txt
add fetch versions
minor update
minor update
minor update
调整代码提示
add local installed version into candidate versions
minor bug fix