Specify MSRV

Author: fengalin

.github/workflows/CI.yml

@@ -4,7 +4,7 @@ on:
   push:
     branches: [ main ]
   pull_request:
-    branches: [ main ]
+  workflow_dispatch:
 
 env:
   CARGO_TERM_COLOR: always
@@ -21,15 +21,30 @@ jobs:
       run: cargo clippy --tests
 
   build:
-    name: "Build & Tests"
+    name: "Build & Test"
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - beta
+          - nightly
+          - "1.53.0"
     steps:
     - uses: actions/checkout@v2
-    - name: Build
-      run: cargo build --verbose
-    - name: Tests default features
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ matrix.rust }}
+        override: true
+    - name: Test default features
       run: cargo test --verbose
-    - name: Tests no default features
+    - name: Test no default features
       run: cargo test --verbose --no-default-features
+
+  doc:
+    name: "Doc"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
     - name: Check doc generation
       run: cargo doc --verbose

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Added
 
 - Fix repository link in `Cargo.toml`.
+- Specify Minimum Supported Rust Version.
 
 ### Fixed
 

Cargo.toml

@@ -9,6 +9,7 @@ license = "MIT/Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/fengalin/option-operations"
 edition = "2018"
+rust-version = "1.53"
 
 [features]
 default = ["std"]

README.md

@@ -3,6 +3,7 @@
 [![crates.io][Crate Logo]][Crate]
 [![Documentation][Doc Logo]][Doc]
 [![Build Status][CI Logo]][CI]
+[![MSRV][rustc Logo]][Crate]
 
 `option-operations` provides traits and auto-implementations to
 improve arithmetic operations usability when dealing with `Option`s.
@@ -95,3 +96,4 @@ at your option.
 [CI]: https://github.com/fengalin/option-operations/actions/workflows/CI.yml
 [CI Logo]: https://github.com/fengalin/option-operations/workflows/CI/badge.svg
 
+[rustc Logo]: https://img.shields.io/badge/rust-1.53.0%2B-blue.svg?maxAge=3600