Bump github.com/hashicorp/go-immutable-radix from 1.3.0 to 1.3.1 (#134)

Bumps [github.com/hashicorp/go-immutable-radix](https://github.com/hashicorp/go-immutable-radix) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/hashicorp/go-immutable-radix/releases)
- [Changelog](https://github.com/hashicorp/go-immutable-radix/blob/master/CHANGELOG.md)
- [Commits](hashicorp/go-immutable-radix@v1.3.0...v1.3.1)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/go-immutable-radix
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -3,6 +3,6 @@ module github.com/hashicorp/go-memdb
 go 1.13
 
 require (
-	github.com/hashicorp/go-immutable-radix v1.3.0
+	github.com/hashicorp/go-immutable-radix v1.3.1
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
 )

go.sum

@@ -1,5 +1,5 @@
-github.com/hashicorp/go-immutable-radix v1.3.0 h1:8exGP7ego3OmkfksihtSouGMZ+hQrhxx+FVELeXpVPE=
-github.com/hashicorp/go-immutable-radix v1.3.0/go.mod h1:0y9vanUI8NX6FsYoO3zeMjhV/C5i9g4Q3DwcSNZ4P60=
+github.com/hashicorp/go-immutable-radix v1.3.1 h1:DKHmCUm2hRBK510BaiZlwvpD40f8bJFeZnpfm2KLowc=
+github.com/hashicorp/go-immutable-radix v1.3.1/go.mod h1:0y9vanUI8NX6FsYoO3zeMjhV/C5i9g4Q3DwcSNZ4P60=
 github.com/hashicorp/go-uuid v1.0.0 h1:RS8zrF7PhGwyNPOtxSClXXj9HA8feRnJzgnI1RJCSnM=
 github.com/hashicorp/go-uuid v1.0.0/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=