message: Fix README.md typo error
diff: A simple C++ binary to benchmark a TFLite model and its individual operators,
  both on desktop machines and on Android. The binary takes a TFLite model,
  generates random inputs and then repeatedly runs the model for specified number
  -of runs. Aggregrate latency statistics are reported after running the benchmark.
  +of runs. Aggregate latency statistics are reported after running the benchmark.
  The instructions below are for running the binary on Desktop and Android,
  for iOS please use the
  