Bump version to 0.6.4

Author: Routhleck

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "canns-lib"
-version = "0.6.3"
+version = "0.6.4"
 edition = "2021"
 license = "Apache-2.0"
 authors = ["Sichao He <sichaohe@outlook.com>"]
@@ -31,6 +31,7 @@ mimalloc = { version = "0.1.43", default-features = false }
 pinboard = "2.2"
 rand = "0.8"
 rand_distr = "0.4"
+statrs = "0.16"  # 用于 Rayleigh 分布的 CDF/inverse CDF 计算
 
 [build-dependencies]
 pyo3-build-config = "0.20"

python/canns_lib/_version.py

@@ -1,3 +1,3 @@
 """Project-wide version string."""
 
-__version__ = "0.6.3"
+__version__ = "0.6.4"