Add toggle back spec for exercise 01

[norchow]

Hi,

Doing the training at Frontend Masters, i run into an issue where my code passed the spec but it wasn't working as expected.

Basically, if in exercise one, you don't toggle the on value, but you just set it to true, the tests were passing. The solution could look like:

toggle = () => {
    this.setState(
      currentState => ({
        on: true,
      }),
      () => this.props.onToggle(this.state.on),
    )
  }

I've just added a new spec, to test this behaviour. Let me know what you think.

[codecov[bot]]

Codecov Report

Merging #60 into master will not change coverage. The diff coverage is n/a.

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##           master      #60   +/-   ##
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  Coverage   39.67%   39.67%           
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  Files          22       22           
  Lines         431      431           
  Branches       66       66           
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  Hits          171      171           
  Misses        217      217           
  Partials       43       43

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[kentcdodds]

@all-contributors please add @norchow for tests

[allcontributors[bot]]

@kentcdodds

I've put up a pull request to add @norchow! :tada: