Bump num-rational from 0.3.0 to 0.3.1

Bumps [num-rational](https://github.com/rust-num/num-rational) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/rust-num/num-rational/releases)
- [Changelog](https://github.com/rust-num/num-rational/blob/master/RELEASES.md)
- [Commits](https://github.com/rust-num/num-rational/compare/num-rational-0.3.0...num-rational-0.3.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.lock

@@ -371,9 +371,9 @@ dependencies = [
 
 [[package]]
 name = "num-rational"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5b4d7360f362cfb50dde8143501e6940b22f644be75a4cc90b2d81968908138"
+checksum = "e5fa6d5f418879385b213d905f7cf5bf4aa553d4c380f0152d1d4f2749186fa9"
 dependencies = [
  "autocfg",
  "num-integer",