message: Added Oxford comma in README.md
  Added an Oxford comma to line 28, to be consistent with the rest of the file.
diff: @@ -25,7 +25,7 @@ networks research. The system is general enough to be applicable in a wide
  variety of other domains, as well.
  TensorFlow provides stable Python and C APIs as well as non-guaranteed backwards
  -compatible API's for C++, Go, Java, JavaScript and Swift.
  +compatible API's for C++, Go, Java, JavaScript, and Swift.
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