Add github workflows

.github/workflows/tests.yml

@@ -0,0 +1,62 @@
+name: tests
+
+on:
+  push:
+    paths-ignore:
+      - 'LICENSE'
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - 'LICENSE'
+      - '**.md'
+
+jobs:
+  linters:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Install rustfmt and clippy
+        run: rustup component add rustfmt clippy
+      - name: Cargo fmt
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: -- --check
+      - name: Cargo clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+  tests:
+    strategy:
+      matrix:
+        os: [ ubuntu-20.04, windows-2019, macos-10.15]
+        rust: [ stable ]
+
+    needs: [linters]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - name: Test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          toolchain: ${{ matrix.rust }}
+          args: --verbose

README.md

@@ -1,10 +1,12 @@
 # rust-ico
 
+[![Build Status](https://github.com/mdsteele/rust-ico/actions/workflows/tests.yml/badge.svg)](https://github.com/mdsteele/rust-ico/actions/workflows/tests.yml)
+[![Crates.io](https://img.shields.io/crates/v/ico.svg)](https://crates.io/crates/ico)
+[![Documentation](https://docs.rs/ico/badge.svg)](https://docs.rs/ico)
+
 A pure Rust library for encoding/decoding
 [ICO image files](https://en.wikipedia.org/wiki/ICO_%28file_format%29).
 
-Documentation: https://docs.rs/ico/
-
 ## Overview
 
 An ICO file (.ico) stores a collection of small images of different sizes and

src/lib.rs

@@ -451,13 +451,13 @@ impl IconImage {
         height: u32,
         rgba_data: Vec<u8>,
     ) -> IconImage {
-        if width < MIN_WIDTH || width > MAX_WIDTH {
+        if !(MIN_WIDTH..=MAX_WIDTH).contains(&width) {
             panic!(
                 "Invalid width (was {}, but range is {}-{})",
                 width, MIN_WIDTH, MAX_WIDTH
             );
         }
-        if height < MIN_HEIGHT || height > MAX_HEIGHT {
+        if !(MIN_HEIGHT..=MAX_HEIGHT).contains(&height) {
             panic!(
                 "Invalid height (was {}, but range is {}-{})",
                 height, MIN_HEIGHT, MAX_HEIGHT