Increase MSRV to 1.38.0 and document

Author: Cole Miller

.travis.yml

@@ -33,8 +33,8 @@ matrix:
     - name: "x86_64-unknown-linux-gnu (stable)"
       rust: stable
       env: TARGET=x86_64-unknown-linux-gnu
-    - name: "x86_64-unknown-linux-gnu (Rust 1.36.0)"
-      rust: 1.36.0
+    - name: "x86_64-unknown-linux-gnu (Rust 1.38.0)"
+      rust: 1.38.0
       env: TARGET=x86_64-unknown-linux-gnu
     - name: "i686-unknown-linux-gnu"
       env: TARGET=i686-unknown-linux-gnu CROSS=1

CHANGELOG.md

@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Improved branch prediction hints on stable. (#209)
 - Optimized hashing of primitive types with AHash using specialization. (#207)
 - Only instantiate `RawTable`'s reserve functions once per key-value. (#204)
+- The minimum Rust version has been bumped to 1.38 (due to use of
+  `pointer::cast`). (#230)
 
 ## [v0.9.1] - 2020-09-28
 

README.md

@@ -4,7 +4,7 @@ hashbrown
 [![Build Status](https://travis-ci.com/rust-lang/hashbrown.svg?branch=master)](https://travis-ci.com/rust-lang/hashbrown)
 [![Crates.io](https://img.shields.io/crates/v/hashbrown.svg)](https://crates.io/crates/hashbrown)
 [![Documentation](https://docs.rs/hashbrown/badge.svg)](https://docs.rs/hashbrown)
-[![Rust](https://img.shields.io/badge/rust-1.36.0%2B-blue.svg?maxAge=3600)](https://github.com/rust-lang/hashbrown)
+[![Rust](https://img.shields.io/badge/rust-1.38.0%2B-blue.svg?maxAge=3600)](https://github.com/rust-lang/hashbrown)
 
 This crate is a Rust port of Google's high-performance [SwissTable] hash
 map, adapted to make it a drop-in replacement for Rust's standard `HashMap`