ci: add test with MSRV 1.63.0

Author: notmandatory

.github/workflows/cont_integration.yml

@@ -3,13 +3,17 @@ on: [push, pull_request]
 name: CI
 
 jobs:
-
   test-fmt:
     name: Test
     runs-on: ubuntu-20.04
     env:
       TEST_ELECTRUM_SERVER: electrum.blockstream.info:50001
       #TEST_ELECTRUM_SERVER: bitcoin.aranguren.org:50001
+    strategy:
+      matrix:
+        rust:
+          - stable # STABLE
+          - 1.63.0 # MSRV
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -24,7 +28,7 @@ jobs:
       - name: Install rustup
         run: curl https://sh.rustup.rs -sSf | sh -s -- -y
       - name: Set default toolchain
-        run: $HOME/.cargo/bin/rustup default stable
+        run: $HOME/.cargo/bin/rustup default ${{ matrix.rust }}
       - name: Set profile
         run: $HOME/.cargo/bin/rustup set profile minimal
       - name: Fmt

Cargo.toml

@@ -9,6 +9,7 @@ documentation = "https://docs.rs/electrum-client/"
 description = "Bitcoin Electrum client library. Supports plaintext, TLS and Onion servers."
 keywords = ["bitcoin", "electrum"]
 readme = "README.md"
+rust-version = "1.63.0"
 
 # loosely based on https://github.com/evgeniy-scherbina/rust-electrumx-client
 

README.md

@@ -1,8 +1,11 @@
-# rust-electrum-client [![Build Status]][GitHub Workflow] [![Latest Version]][crates.io]
+# rust-electrum-client 
+[![Build Status]][GitHub Workflow] [![Latest Version]][crates.io] [![MSRV Badge]][Rust Blog]
 
 [Build Status]: https://github.com/bitcoindevkit/rust-electrum-client/actions/workflows/cont_integration.yml/badge.svg
 [GitHub Workflow]: https://github.com/bitcoindevkit/rust-electrum-client/actions?query=workflow%3ACI
 [Latest Version]: https://img.shields.io/crates/v/electrum-client.svg
 [crates.io]: https://crates.io/crates/electrum-client
+[MSRV Badge]: https://img.shields.io/badge/rustc-1.63.0%2B-lightgrey.svg
+[Rust Blog]: https://blog.rust-lang.org/2022/08/11/Rust-1.63.0.html
 
 Bitcoin Electrum client library. Supports plaintext, TLS and Onion servers.