Update README.md

Co-authored-by: Kristian Sloth Lauszus <lauszus@gmail.com>
Signed-off-by: John Sirois <john.sirois@gmail.com>

README.md

@@ -142,7 +142,7 @@ distribution is ~28M:
 ## Building `ptex`
 
 The `ptex` binary is [released](https://github.com/a-scie/ptex/releases) for Linux (x86_64,
-aarch64 & armv7), macOS (x86_64 & aarch64) and Windows (x86_64 & aarch64). If you'd like to build
+aarch64 & armv7l), macOS (x86_64 & aarch64) and Windows (x86_64 & aarch64). If you'd like to build
 your own copy, you'll need [Rust installed](https://rustup.rs/) at which point you can run
 `cargo run -p package` and a binary for your current machine will be built in `dist/` along with a
 sha256 checksum file. For more build options, you can run `cargo run -p package -- --help`. On some