Update version number of rand_core to 0.3.1

Author: dhardy

Diff for: rand_core/CHANGELOG.md

@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.3.1] - 2019-01-25
+- Compatibility shim around version 0.4
+
 ## [0.3.0] - 2018-09-24
 - Add `SeedableRng::seed_from_u64` for convenient seeding. (#537)
 

Diff for: rand_core/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rand_core"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["The Rand Project Developers", "The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"