v0.28.1

Commits

• ba7f5e4: Return ESTALE to all operations with stale inodes (Vitaliy Filippov)
• 8ad5d3b: Prevent removal of the directory from cache while it has open files (Vitaliy Filippov)
• ea6afb1: Change logging of rename & unlink (Vitaliy Filippov)
• 04777d4: Do not die on flushes failing after delete (Vitaliy Filippov)
• 1a9cf76: Add rename failure message (Vitaliy Filippov)
• 051b99f: Bump version to 0.28.1 (Vitaliy Filippov)