v0.15.3

Added

• SIMD implementation for LoongArch (#592, requires nightly)

Changed

• Optimized insertion path by avoiding an unnecessary match_empty (#607)
• Increased minimum table size for small types (#615)
• Dropped FnMut trait bounds from ExtractIf data structures (#616)
• Relaxed constraint in hash_map::EntryRef insertion methods K: From<&Q> to &Q: Into<K> (#611)
• Added allocator template argument for rustc_iter (#605)
• The allocator-api2/nightly feature is no longer enabled by hashbrown/nightly (#606)