adjust README to indicate zstd runs in parallel, remove leftover code…

… comment

README.md

@@ -113,7 +113,7 @@ Output:
 
 | Format    | `.tar` | `.zip` | `7z` | `.gz` | `.xz`, `.lzma` | `.bz`, `.bz2` | `.lz4` | `.sz` (Snappy) | `.zst` | `.rar` |
 |:---------:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
-| Supported | ✓ | ✓¹ | ✓¹ | ✓² | ✓ | ✓ | ✓ | ✓² | ✓ | ✓³ |
+| Supported | ✓ | ✓¹ | ✓¹ | ✓² | ✓ | ✓ | ✓ | ✓² | ✓² | ✓³ |
 
 ✓: Supports compression and decompression.
 

src/commands/compress.rs

@@ -77,9 +77,6 @@ pub fn compress_files(
                 )?;
                 // Use all available PHYSICAL cores for compression
                 zstd_encoder.multithread(num_cpus::get_physical() as u32)?;
-                // Safety:
-                //     Encoder::new() can only fail if `level` is invalid, but the level
-                //     is `clamp`ed and therefore guaranteed to be valid
                 Box::new(zstd_encoder.auto_finish())
             }
             Tar | Zip | Rar | SevenZip => unreachable!(),