build: include replaygain feature in release binaries

- Update release workflow to build with --features replaygain
- Update README to note that binaries include ReplayGain support

Author: m_igashi

.github/workflows/release.yml

@@ -35,7 +35,7 @@ jobs:
           targets: ${{ matrix.target }}
 
       - name: Build
-        run: cargo build --release --target ${{ matrix.target }}
+        run: cargo build --release --features replaygain --target ${{ matrix.target }}
 
       - name: Upload artifact (Unix)
         if: runner.os != 'Windows'

README.md

@@ -45,6 +45,8 @@ Download the latest release from [GitHub Releases](https://github.com/M-Igashi/m
 - Windows (x86_64): `mp3rgain-*-windows-x86_64.zip`
 - Windows (ARM64): `mp3rgain-*-windows-arm64.zip`
 
+All binaries include ReplayGain support (`-r` and `-a` options).
+
 ## Usage
 
 ### Show file information (default)