v0.12.1

JuiceFS v0.12.1 had fixed a few bugs and improvements on scalability.

Changes

• Only cleanup leaked chunk in juicefs gc, which may overload redis on larger cluster (6358e38).
• Improve sessions cleanup to avoid scanning all keys (#293).
• Use hash set for refcount of slices to avoid scanning all keys (#294).
• Cleanup zero refcount of slices to save memory (#295).
• Support case insensitivity in Windows (#303).

Bugfix

• Fixed ranged get for swift (dcd7057).
• Fixed random read benchmark on files larger than 2G (#305).
• Fixed listing of files on root directory in Windows (#306)