clarify msrv support (#375)

* clarify msrv support

* pin byteorder to valid versions

Cargo.toml

@@ -16,7 +16,7 @@ license = "MIT"
 description = "A binary serialization / deserialization strategy that uses Serde for transforming structs into bytes and vice versa!"
 
 [dependencies]
-byteorder = "1.3.0"
+byteorder = ">=1.3.0, < 1.4.0"
 serde = "1.0.63"
 
 [dev-dependencies]

README.md

@@ -5,6 +5,7 @@
 ![CI](https://github.com/servo/bincode/workflows/CI/badge.svg)
 [![](https://meritbadge.herokuapp.com/bincode)](https://crates.io/crates/bincode)
 [![](https://img.shields.io/badge/license-MIT-blue.svg)](https://opensource.org/licenses/MIT)
+[![](https://img.shields.io/badge/bincode-rustc_1.18+-lightgray.svg)](https://blog.rust-lang.org/2017/06/08/Rust-1.18.html)
 
 A compact encoder / decoder pair that uses a binary zero-fluff encoding scheme.
 The size of the encoded object will be the same or smaller than the size that
@@ -105,3 +106,7 @@ issues, assuming that the deserialization code for the struct is safe itself.
 Bincode can be used for untrusted inputs in the sense that it will not create a
 security issues in your application, provided the configuration is changed to enable a
 maximum size limit. Malicious inputs will fail upon deserialization.
+
+### What is Bincode's MSRV (minimum supported Rust version)?
+
+Bincode 1.0 maintains support for rust 1.18.0. Any changes to this are considered a breaking change for semver purposes.