[docs] Add clang-format to macOS install instructions.
@@ -18,7 +18,7 @@ On macOS the required dependencies can be installed using
[homebrew](https://docs.brew.sh/Installation):
```sh
-brew install bazelisk buildifier hadolint prototool zlib
+brew install bazelisk buildifier clang-format hadolint prototool zlib
export LDFLAGS="-L/usr/local/opt/zlib/lib"
export CPPFLAGS="-I/usr/local/opt/zlib/include"
export PKG_CONFIG_PATH="/usr/local/opt/zlib/lib/pkgconfig"
