Bump up num-complex 0.3.1 (#4)

* num-complex 0.3.1

* Drop patch version specification

Author: termoshtt

Cargo.toml

@@ -14,4 +14,4 @@ keywords = ["linear-algebra"]
 [dependencies]
 cblas-sys = "0.1"
 libc = "0.2"
-num-complex = { version = "0.2", default-features = false }
+num-complex = { version = "0.3", default-features = false }