adds padding to container and negative margin to rows to align with BS 4 grid

[apisandipas]

The Bootstrap grid has a quirky feature of having negative margins on rows. This is because theres ideally 1 container and any number of infinitely nested Rows and Columns. The negative margin on Rows enables this nesting capability and is missing from your implementation, which I quite otherwise like. Hope you will consider this PR and happy coding.

[aichbauer]

@apisandipas thanks for contributing

I will take a look at this PR as soon as possible.

[michaelkryukov]

@apisandipas, hey, I think you should update snapshots and follow this project's code style (Airbnb) to better fit your changes into the repo :+1:

[aichbauer]

@apisandipas If you consider the changes @michaelkrukov proposed we could definitely consider this feature/fix.

[apisandipas]

Updated to removed my 'prettier' formatting, sorry about that. Now you can see, it's a really simple change.

[apisandipas]

Okay, I've updated the snapshots as requested now too.

[codecov-io]

Codecov Report

Merging #70 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #70   +/-   ##
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  Coverage     100%   100%           
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  Files         112    112           
  Lines        1808   1808           
  Branches      343    343           
=====================================
  Hits         1808   1808

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