Updated README.md

Author: samyarsadat

README.md

@@ -29,7 +29,7 @@ This is a Docker container action.
 | `cmake_args`          | _Additional arguments to pass to CMake._                                                                                                                         | No       | `""`                         |
 | `output_ignored_dirs` | _A space-separated list of directories to ignore when copying binary build artifacts. `CMakeFiles`, `pico-sdk`, `pioasm`, and `elf2uf2` are ignored regardless._ | No       | `""`                         |
 | `cmake_config_only`   | _Only configure CMake and generate build files. Do not build the project._                                                                                       | No       | `"false"`                    |
-| `makefiles_generator` | _CMake generator to use for generating build files._                                                                                                             | No       | `"Ninja"`                    |
+| `makefiles_generator` | _CMake generator to use for generating build files._                                                                                                             | No       | `"Unix Makefiles"`           |
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 ## Outputs