[X-update] check mkdir on temp_path, if impossible do as "safemode"
Update README.md
Update README.md
[X-update] version 0.52
[X-update] fix censor of detailed_version

detailed_version が新設された場合に、要アップデートを検知できない問題の修正。
[X-update] Version 0.53
Revert "[X-update] Version 0.53"

This reverts commit e4c849ecda6a40074ad77c81551efcd42f38254a.
[X-update] re-fix censor of detailed_version
[X-update] version 0.53
Merge branch 'xupdate' into CorePack