Fix link in CHANGELOG

Author: termoshtt

CHANGELOG.md

@@ -4,7 +4,7 @@ Unreleased
 Updated dependencies
 ---------------------
 - ndarray 0.15 https://github.com/rust-ndarray/ndarray-linalg/pull/273
-- cauchy 0.4 (num-complex 0.4, rand 0.8), lapack 0.18 https://github.com/rust-ndarray/ndarray-linalg/pull/277
+- cauchy 0.4 (num-complex 0.4, rand 0.8), lapack 0.18 https://github.com/rust-ndarray/ndarray-linalg/pull/276
 
 0.13.1 - 13 March 2021
 =====================