Bumped approx's version number.

Author: obsgolem

Cargo.toml

@@ -33,7 +33,7 @@ num-complex = { version = "0.4", default-features = false }
 # Use via the `rayon` crate feature!
 rayon_ = { version = "1.0.3", optional = true, package = "rayon" }
 
-approx = { version = "0.4", optional = true , default-features = false }
+approx = { version = "0.5", optional = true , default-features = false }
 
 # Use via the `blas` crate feature!
 cblas-sys = { version = "0.1.4", optional = true, default-features = false }