fixing readme example

[codeheart09]

I believe there was a small error in the documentation (look at how the array was flat in the predict()).

If I run the code how it was, I receive the following error:

var _this = _super.call(this, message) || this;
                   ^

ValueError: Error when checking : expected dense_Dense1_input to have shape [null,1] but got array with shape [1,2].
    at new ValueError (.../node_modules/@tensorflow/tfjs-layers/dist/tf-layers.node.js:10080:28)
    at checkInputData (.../node_modules/@tensorflow/tfjs-layers/dist/tf-layers.node.js:19373:31)
    at LayersModel.predict (.../node_modules/@tensorflow/tfjs-layers/dist/tf-layers.node.js:20051:9)
    at Sequential.predict (.../node_modules/@tensorflow/tfjs-layers/dist/tf-layers.node.js:21555:27)
    at LinearRegression.predict (.../dist/node/linear_model/sgdRegressor.js:204:40)
    at main (.../test/mock/basic-node.mjs:10:18)

So I made the change to what I believe to be the intended way - but let me know if I'm not correct!

:)

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[dcrescim]

You're a champion @codeheart09