Bump MSRV to 1.60, set edition to 2021

Author: aldanor

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [stable, beta, nightly, 1.51.0]  # MSRV=1.51
+        rust: [stable, beta, nightly, 1.61.0]  # MSRV=1.61
     steps:
       - uses: actions/checkout@v2
         with: {submodules: true}

Cargo.toml

@@ -3,7 +3,7 @@ name = "qoi"
 version = "0.4.0"
 description = "VERY fast encoder/decoder for QOI (Quite Okay Image) format"
 authors = ["Ivan Smirnov <[email protected]>"]
-edition = "2018"
+edition = "2021"
 readme = "README.md"
 license = "MIT/Apache-2.0"
 repository = "https://github.com/aldanor/qoi-rust"
@@ -14,7 +14,7 @@ keywords = ["qoi", "graphics", "image", "encoding"]
 exclude = [
     "assets/*",
 ]
-rust-version = "1.51.0"
+rust-version = "1.61.0"
 
 [features]
 default = ["std"]

README.md

@@ -51,8 +51,7 @@ this library proved to be the fastest one by a noticeable margin.
 
 ### Rust version
 
-The minimum required Rust version is 1.51.0 (any changes to this would be
-considered to be a breaking change).
+The minimum required Rust version for the latest crate version is 1.61.0.
 
 ### `no_std`