docs: note the erronous 6.3.2 in changelog

(6.3.2 was the same thing as 6.3.1 released by git accident.)

Author: Fishrock123

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://book.async.rs/overview
 
 ## [Unreleased]
 
+## [6.3.2] - 2021-03-01
+
+_(This was the same thing as 6.3.1 released by git accident.)_
+
 ## [6.3.1] - 2021-02-15
 
 ### Fixed

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "http-client"
-version = "6.3.1"
+version = "6.3.2"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/http-rs/http-client"
 documentation = "https://docs.rs/http-client"