message: Update README.md
  Actually got the link from .... This is the updated link to the person_detection package zip..
diff: @@ -77,7 +77,7 @@ Connect the Arducam pins as follows:
  To use this sample application with Arduino, we've created an Arduino library
  that includes it as an example that you can open in the Arduino IDE.
  -Download the current nightly build of the library: [person_detection.zip](https://storage.googleapis.com/tensorflow-nightly/github/tensorflow/tensorflow/lite/experimental/micro/tools/make/gen/arduino_x86_64/prj/person_detection/person_detection.zip)
  +Download the current nightly build of the library: [person_detection.zip](https://storage.googleapis.com/tensorflow-nightly/github/tensorflow/tensorflow/lite/experimental/micro/tools/make/gen/arduino_x86_64/prj/person_detection/tensorflow_lite.zip)
  Next, import this zip file into the Arduino IDE by going to
  `Sketch -> Include Library -> Add .ZIP Library...`.
  