Merge pull request #532 from remilauzier/master

update approx to 0.5

Author: aloucks

Cargo.toml

@@ -21,7 +21,7 @@ unstable = []
 swizzle = []
 
 [dependencies]
-approx = "0.4"
+approx = "0.5"
 mint = { version = "0.5", optional = true }
 num-traits = "0.2"
 # small_rng used only for benchmarks