message: Micro: Fix error in README for network_tester example
diff: @@ -19,7 +19,7 @@ the new model. This is done by using the `ARENA_SIZE` option when running
  `make`.
  ```
  -make -f tensorflow/lite/micro/example/network_tester_test \
  +make -f tensorflow/lite/micro/tools/make/Makefile network_tester_test \
  NETWORK_MODEL=path/to/network_model.h \
  INPUT_DATA=path/to/input_data.h \
  OUTPUT_DATA=path/to/expected_output_data.h \
  