[WIP] Feature/rerendering events based on children

[oyvindhermansen]

This PR attempts to solving #14 , but it's just a implementation suggestion. Open for feedback on this one.

The solution i came up with is this:

Every time children of <ImagesLoaded /> updates, the imagesLoaded instance re-initializes and fires all events again. This has been solved using componentDidUpdate for props.children-checks.

When componentDidUpdate fires, I've also added an onUpdate-prop that can be implemented like this:

class ImagesLoadedTest extends React.Component {
  render() {
    return (
       <ImagesLoaded 
         onUpdate={() => console.log('children has updated')}
       >
        {/*....*/}
      </ImagesLoaded>
     )
  }
}

[codecov-io]

Codecov Report

Merging #15 into master will increase coverage by 29.41%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #15       +/-   ##
=========================================
+ Coverage   70.58%   100%   +29.41%     
=========================================
  Files           1      1               
  Lines          17     24        +7     
  Branches        0      1        +1     
=========================================
+ Hits           12     24       +12     
+ Misses          5      0        -5

Impacted Files	Coverage Δ
src/index.js	100% <100%> (+29.41%)	⬆️

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