Bump MSRV from 1.56.0 to 1.56.1

In this way we can continue using reqwest v0.11, whose MSRV is now
1.56.1
The only difference between v1.56.0 and v1.56.1 is a bug fix for
CVE-2021-42574.

.github/workflows/cont_integration.yml

@@ -12,7 +12,7 @@ jobs:
         rust:
           - version: 1.60.0 # STABLE
             clippy: true
-          - version: 1.56.0 # MSRV
+          - version: 1.56.1 # MSRV
         features:
           - default
           - minimal
@@ -146,7 +146,7 @@ jobs:
       - run: sudo apt-get update || exit 1
       - run: sudo apt-get install -y libclang-common-10-dev clang-10 libc6-dev-i386 || exit 1
       - name: Set default toolchain
-        run: rustup default 1.56.0 # STABLE
+        run: rustup default 1.56.1 # STABLE
       - name: Set profile
         run: rustup set profile minimal
       - name: Add target wasm32

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- New MSRV set to `1.56.1`
 
 ## [v0.19.0] - [v0.18.0]
 

README.md

@@ -13,7 +13,7 @@
     <a href="https://github.com/bitcoindevkit/bdk/actions?query=workflow%3ACI"><img alt="CI Status" src="https://github.com/bitcoindevkit/bdk/workflows/CI/badge.svg"></a>
     <a href="https://codecov.io/gh/bitcoindevkit/bdk"><img src="https://codecov.io/gh/bitcoindevkit/bdk/branch/master/graph/badge.svg"/></a>
     <a href="https://docs.rs/bdk"><img alt="API Docs" src="https://img.shields.io/badge/docs.rs-bdk-green"/></a>
-    <a href="https://blog.rust-lang.org/2020/08/27/Rust-1.56.0.html"><img alt="Rustc Version 1.56+" src="https://img.shields.io/badge/rustc-1.56%2B-lightgrey.svg"/></a>
+    <a href="https://blog.rust-lang.org/2020/08/27/Rust-1.56.1.html"><img alt="Rustc Version 1.56.1+" src="https://img.shields.io/badge/rustc-1.56.1%2B-lightgrey.svg"/></a>
     <a href="https://discord.gg/d7NkDKm"><img alt="Chat on Discord" src="https://img.shields.io/discord/753336465005608961?logo=discord"></a>
   </p>