Fix for #183 - issue with removing a preset from users babelrc

[witnessmenow]

Here is our babelrc

{
  "presets": [
    "es2015",
    "react",
    "stage-1"
  ],
  "plugins": ["transform-object-rest-spread"],
  "sourceRoot": "./src,./test"
}

indexOf('react-hmre') was returning -1 as we don't have it in our presets and presets.splice(-1,1) was removing the last preset from our configuration.

I ran npm run test and linter and tests all passed.

Thanks

[nx-cloud]

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