Updated SplitPane - Resize logic updated

[arpitgarg101]

Thanks for contributing to react-split-pane!

Before submitting a pull request, please complete the following checklist:

• The existing test suites (yarn run test) all pass
• For any new features or bug fixes, both positive and negative test cases have been added
• For any new features, documentation has been added
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[coveralls]

Coverage remained the same at 93.548% when pulling f9f86c6 on arpitgarg101:patch-1 into 9c49aad on tomkp:v2.

[arpitgarg101]

@tomkp @wuweiweiwu @davvidbaker Can you please review my PR, I am using your react-split-pane v2.0.2 npm package in one of my projects and recently I saw there is some problem with the resizing of panes. I have raised the PR #406 as a fix for that, please can you review it and merge it to v2 branch so that I can import the package in my project. It would be of great help.

[wuweiweiwu]

nice catch!

[arpitgarg101]

@tomkp @wuweiweiwu can you publish the branch change as the npm package? So, I can import that package as in the npm package v2.0.2 I still see the old change