Bump MSRV to 1.48.1

As per discussion [0] bump our MSRV for all crates in `rust-bitcoin`
repo to 1.48.1 [1].

[0] https://github.com/rust-bitcoin/rust-bitcoin/discussions/1329
[1] https://blog.rust-lang.org/2020/11/19/Rust-1.48.html

.github/workflows/rust.yml

@@ -66,7 +66,7 @@ jobs:
         run: ./contrib/test.sh
 
   MSRV:
-    name: Test - 1.41.1 toolchain
+    name: Test - 1.48.0 toolchain
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -74,24 +74,10 @@ jobs:
       - name: Checkout Crate
         uses: actions/checkout@v3
       - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@1.41.1
+        uses: dtolnay/rust-toolchain@1.48.0
       - name: Running test script
         env:
           DO_FEATURE_MATRIX: true
-        run: ./contrib/test.sh
-
-  NoStd:
-    name: Test - 1.47 toolchain
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-    steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v3
-      - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@1.47
-      - name: Running test script
-        env:
           DO_NO_STD: true
         run: ./contrib/test.sh
 

README.md

@@ -12,7 +12,7 @@
     <a href="https://github.com/rust-bitcoin/rust-bitcoin/blob/master/LICENSE"><img alt="CC0 1.0 Universal Licensed" src="https://img.shields.io/badge/license-CC0--1.0-blue.svg"/></a>
     <a href="https://github.com/rust-bitcoin/rust-bitcoin/actions?query=workflow%3AContinuous%20integration"><img alt="CI Status" src="https://github.com/rust-bitcoin/rust-bitcoin/workflows/Continuous%20integration/badge.svg"></a>
     <a href="https://docs.rs/bitcoin"><img alt="API Docs" src="https://img.shields.io/badge/docs.rs-bitcoin-green"/></a>
-    <a href="https://blog.rust-lang.org/2020/02/27/Rust-1.41.1.html"><img alt="Rustc Version 1.41.1+" src="https://img.shields.io/badge/rustc-1.41.1%2B-lightgrey.svg"/></a>
+    <a href="https://blog.rust-lang.org/2020/02/27/Rust-1.48.0.html"><img alt="Rustc Version 1.48.0+" src="https://img.shields.io/badge/rustc-1.48.0%2B-lightgrey.svg"/></a>
     <a href="https://gnusha.org/bitcoin-rust/"><img alt="Chat on IRC" src="https://img.shields.io/badge/irc-%23bitcoin--rust%20on%20libera.chat-blue"></a>
     <a href="https://github.com/model-checking/kani"><imp alt="kani" src="https://github.com/rust-bitcoin/rust-bitcoin/actions/workflows/kani.yaml/badge.svg"></a>
     <img alt="Lines of code" src="https://img.shields.io/tokei/lines/github/rust-bitcoin/rust-bitcoin">
@@ -76,10 +76,9 @@ For more information please see `./CONTRIBUTING.md`.
 
 ## Minimum Supported Rust Version (MSRV)
 
-This library should always compile with any combination of features (minus
+This library should always compile with any combination of features on **Rust 1.48.0**.
-`no-std`) on **Rust 1.41.1** or **Rust 1.47** with `no-std`.
 
-To build with the MSRV you will need to pin some dependencies (also for `no-std`):
+To build with the MSRV you will need to pin some dependencies:
 ```
 cargo update -p serde --precise 1.0.156
 cargo update -p syn --precise 1.0.107

bitcoin/contrib/test.sh

@@ -24,19 +24,13 @@ if cargo --version | grep beta; then
 fi
 
 # Pin dependencies as required if we are using MSRV toolchain.
-if cargo --version | grep "1\.41"; then
+if cargo --version | grep "1\.48"; then
     # 1.0.157 uses syn 2.0 which requires edition 2018
     cargo update -p serde --precise 1.0.156
     # 1.0.108 uses `matches!` macro so does not work with Rust 1.41.1, bad `syn` no biscuit.
     cargo update -p syn --precise 1.0.107
 fi
 
-# Pin dependencies as above (required for no-std tests that use Rust 1.47 toolchain).
-if cargo --version | grep "1\.47"; then
-    cargo update -p serde --precise 1.0.156
-    cargo update -p syn --precise 1.0.107
-fi
-
 # We should not have any duplicate dependencies. This catches mistakes made upgrading dependencies
 # in one crate and not in another (e.g. upgrade bitcoin_hashes in bitcoin but not in secp).
 duplicate_dependencies=$(

hashes/README.md

@@ -11,7 +11,7 @@ since these are needed to display hashes anway.
 
 ## Minimum Supported Rust Version (MSRV)
 
-This library should always compile with any combination of features on **Rust 1.41.1**.
+This library should always compile with any combination of features on **Rust 1.48.0**.
 
 ## Contributions